Proceed to solution 1a. In the show, no solution to the puzzle is presented and at first glace I thought this problem was not solvable, since there are only three measurements of two outcomes (seesaw is balanced, or seesaw is unbalanced), meaning we can only discern between 2 = 8 outcomes rather than the 12 we need. And if they are also equal then that would mean that the 12th person weighs different. In this way, x can be found, no matter which islander it is, as all 12 have a test to find an answer for. The island has no escapes, but there is a seesaw. There are 12 men on an island. You can figure out both in three steps. Surprisingly, they never did the grand conclusion was that no one, not even the captain who posed it in the first place, was able to figure it out. This may not be the correct answer for the riddle as it was intended but it is correct for this interpretation. Shift all of the men 3 positions to the right and weigh them again using men from the 3rd group (which you know to all be neutral) to fill in the missing positions on the left scale. Torsion-free virtually free-by-cyclic groups. On one side of a balanced see-saw is an ice cube, on the other side is a basketball. If he is lighter then it is the one being measured and he is lighter. If they are equal then. (Third Use)notethis works equally well if the group was lighter, just replace terms for appropriate identification. sideline: S1 S2 S3 S4. The ice cube and the basketball have the same weight. 12 Islanders Teeter Totter Riddle There is an island with 12 islanders. Subreddit for Brooklyn Nine-Nine, the now NBC TV show that stars Andy Samberg and Andre Braugher. At this point we just weight S4 against a Comparing (1,2,3,4) to (5,6,7,8) does exactly this. If they are the same, 8 is the one we are looking for (and lighter). III) 1 2 3 4 < 5 6 7 8 do the same process as II with appropriate adjustments being made. If they are different, the lighter of the two is the one we are looking for (and lighter). This is the true solution from Captain Holt's brain teaser from Season 2 Episode 18 of Brooklyn 99 : "Captain Peralta." (named after their starting position, L1 = Left 1, R1 = Right 1, S1 = Side 1 etc..), We now know that the odd islander are amongst S1 S2 S3 S4 The answer to 12 Men On An Island Riddle is " First weigh 1, 2, 3, 4 vs 5, 6, 7, and 8 on the seesaw to see if they are equal. You have a seesaw to determine who is the odd one out but you must figure this out in three measurements of the seesaw or less.. Which brings us to Use 3 - Place both new groups 'def123' and 'abc456' on the teeter-totter again as we did in the beginning. note this works equally well if the group was heavier, just replace terms for appropriate identification. I like this answer other than the fact that if "Condition 2.1.2" happens, then we won't be able to tell if the person who has a different weight is lighter or heavier than the others. Press J to jump to the feed. we now know that the heavier islander are amongst S1 S2 S3. (seesaw measurement number 3), 2.A.3 if right is heavy 11 of them weigh the same and one of them is either slightly heavier or slightly lighter. Pardon the handwriting, its usually better. Learn more about Stack Overflow the company, and our products. 42 votes, 14 comments. After you do your fist step you will have eliminated some of the men as possiblilities (they are neutral). (seesaw measurement number 3), 2.A.2 if left is heavy Just forget about them for a few minutes. Weigh 12 against 1 to find out whether 12 is heaver or lighter. Engineering Manager, Grab | Former Director of Engineering, ZilLearn | Former Tech Lead Manager, Hubble | Former Tech Lead, Rakuten Viki | bit.ly/weiyuan. Split the men into two(2) groups 'abcdef' and '123456'. Dealing with hard questions during a software developer interview, "settled in as a Washingtonian" in Andrew's Brain by E. L. Doctorow. The following steps become identical to those in Scenario 1., above. If the seesaw is evenly balanced, then the odd one out is in group 3 or group 4. If the weights are equal, then one of A2.4 is heavier; weigh A2 and A3. If the position of seesaw does not change and as an example say 5678 and then 4678 are heavier, we know that either 6 or 7 or 8 is oddly weighted. How do you do it? You signed in with another tab or window. Thus in principle we can get log227 bits from the three comparisons. It is easier than everyone makes it. Famous Quotes Rewritten to Make Them More Retweetable, Hey Sam, If You Pee on This Wall, It Pees Back At You. (Second Use), If the see saw balances, remove all but one from the seesaw and put one of the remaining two opposite them. The second measurement was unequal, but the balance of weight shifted. Set it up so deduction eliminates everything else and your gold. (First Use). If they are unequal then the odd man is the one within last 2 being measured that is heavier / lighter based on the known weight difference (heavier / lighter). It is of indeterminate length I wish for my see saw to be long enough to place 12 on either side, but only six will be on either side of the fulcrum. we weigh S1 against S2. In either scenario, the steps are basically the same. if balanced it is R4 - else it is the lighter of R3 and R2 Weigh 9, 10, 11 vs 1, 2, 3. Use Git or checkout with SVN using the web URL. I was lying there going through possibilities until 3 am when it hit me, and I got up and wrote down the solution. You must figure out which. Can a VGA monitor be connected to parallel port? (Third Use), If the two groups of 4 don't balance remember which side was lighter, have three get off one end and the remaining person swap places with one of the other four. Has the term "coup" been used for changes in the legal system made by the parliament? The most simple solution is to arrange the people on the scale so that they have a unique correlation with the total information available. Logic Logic puzzles require you to think. There is a little lead up to why it works, but I tried to keep the video short enough to get to the point. You don't know if he is heavier or lighter, just that he is a different weight. Me and my wife sat down to try and solve the "12 islanders riddle" from Brooklyn Nine Nine, this is our solution. (Detailed . Thanks! Death by roo roo. Suppose the previous two groups were 1234 and 5678, shuffle them to create a new group of 5 and 4678 then three of the third four say abcd get on with 5 to get as an example abc5 and 4678. Here's the brain teaser, verbatim from the show: There are 12 men on an island. seesaw: L1 L2 L3 L4 R1 R2 R3 R4 (balanced) Are there basic weighing puzzles requiring adaptive strategies? Proceed to solution 2a. sideline: S1 S2 S3 S4 11 weigh exactly the same amount, but one of them is slightly lighter or heavier. The best answers are voted up and rise to the top, Not the answer you're looking for? Is the set of rational points of an (almost) simple algebraic group simple? The results of that 4x4 measurement will indicate to you to a second specific group of 4 to measure, and from there, only 2. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Let's say 'abc' and '456'. Start off by weighing 4 against 4, setting the other 4 aside completely. Solution 2b. - GitHub - hellgrenj/12-islanders: Me and my wife sat down to try and s. Presented below is a simpler solution. we know it is either R1 or L1. New post because the last one got too old. The riddle 12 men live on an island. 11 of them weigh the same and one of them is either slightly heavier or slightly lighter. You cannot determine lighter, heavier, proceed to solution 2c. Each weighing can give 3 possible answers: left side heavier, right side heavier, or both sides equal. And there you have it! There is also a see-saw on the island. There is also a see-saw on the island. A Puzzle is presented where there are twelve identical looking islanders and a seesaw. You can use the see-saw to figure out which is the odd man, but you can only use it 3 times. The island has no scales but there is a see-saw. Each weighing can give 3 possible answers: left side heavier, right side heavier, or both sides equal. Would the reflected sun's radiation melt ice in LEO? The answer isnt TV friendly. A standard see-saw must be used and only three times. If they are equal then that must mean the 12th person is the different one. So the solution must involve cross-referencing the left, right or balanced measurements of different groups of islanders. I am just looking for a little tweak to this answer. If nothing happens, download GitHub Desktop and try again. Drift correction for sensor readings using a high-pass filter. All our articles and reviews are written independently by the Netmums editorial team. Is it possible to measure 1 kilogram of sugar? The answer to the" 12 people on an island " riddle is weigh 6 on one side and 6 on the other side. sideline: L1 L2 L3 S4 L4 R4 Questions: Take note of the direction that the scale tips, you will use that information to do weight determination in step 2. If the see saw is not balanced, remove one from each end. If this happens, then you know that the light man is amongst the four men you set aside earlier. now compare R2 and R3. The seesaw will balance perfectly. You can tell by the change of balance whether the odd man is heavier or lighter. Puzzling user AeJey has given a very eloquent explanation: Put any two groups on each side of the see-saw. The exciting catch? You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. You don't know heavier or lighter, but you still have 1 remaining move. Therefore you know that the odd man is one of the remaining people on the scale that did not change sides, 1 or 5, but you do not know if the odd man is heavier or lighter. Proceed to step 2. You have a seesaw to determine who is the odd one out but you must figure this out in three measurements of the seesaw or less." Retracting Acceptance Offer to Graduate School, First letter in argument of "\affil" not being output if the first letter is "L", Is email scraping still a thing for spammers, How to choose voltage value of capacitors. WRONG! :D, Brooklyn 99 riddle: Weighing Islanders [duplicate]. Now put 7 on one end and 8 on the other. I could not add my own answer and I felt that editing that post was more work than necessary so forgive me for posting again, as well as for answering below as this was my solution to 'Holts' riddle. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. You cant solve this puzzle? A challenging but doable puzzle from Sunday night TV about weighing 12 men, one of whom is slightly lighter or heavier than the rest. Put any two groups on each side of the see-saw. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. B_ the see-saw becomes level with the ground, therefore the man of a different weight is standing with group 'abc456'. Each islander is given a position to sit on the seesaw for each round. Three measurements in all. This gives you your man. Now you know that one of the four men on one side is light. You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. I gave each of the 12 men a letter, A-L. Can You Solve the Brain Teaser of the 12 Men and a See-Saw? If one is heavier they are the odd one otherwise it is 6. rev2023.3.1.43268. One problem - you have to figure out which person it is too. Now I have islanders 1-6 on side "A" and 7-12 on side "B" both groups of six are as close to the fulcrum of the see saw in a single file line as possible, one side will fall, one side will rise. I just saw the episode last night and I literally couldn't sleep until I figured it out. It only takes a minute to sign up. Number the men from 1 to 12. The exciting catch? @emdee - Here is the link that you posted in the question. Fun: (2.49) Difficulty: (1.28) Puzzle ID: #13528 Submitted By: cool_star. You can only use it three times. If the see-saw balances, we are sure that the oddly wieghted one is in the other group of 4. Thats really not conducive to Andy Samberg zingers. But you can only use the seesaw 3 times. What are the consequences of overstaying in the Schengen area by 2 hours? PTIJ Should we be afraid of Artificial Intelligence? You can weigh three combinations of men on the see-saw. b) If 1,2,5,6,7 is lighter, then one of 5,6,7 is different and lighter. With that info, use your third and final seesaw turn to weigh those last two men to find the light man. If they are equal, it is the remaining man not being measured. You have a seesaw to find out which one is the light man, but you can only use the seesaw three times. The island has no escapes, but there is a seesaw. 2: Place the man from your pair who was on the lower end of the see-saw . Say as example 1234 were lighter. Work fast with our official CLI. Without loss of generality suppose that 1,2,3,4 is heavier than 5,6,7,8. we now know that the odd islander is S4. THIS TIP WILL GIVE AWAY THE MAIN SECRET : Instead of just breaking the men up into groups and comparing those groups against each other, you can shift them from one side of the see saw to the other side. If balanced, the remaining unknonw is the odd one and can be determined in step 3. Thankyou for your input but I believe you are wrong because it is my understanding of Holts dialogue that leads me to conclude it is a simple riddle with a simple solution. They each weigh exactly the same, except for one who weighs either more or less than the others. IF the measurement is equal then the odd man is 12. For example if in the first step you see that the left side is heavier than the right side, then you can use that later in step 2 to determine if the odd man is heavier or lighter. Make 3 groups of 4 people each Group A: 1,2,3,4 Group B: 5,6,7,8 Group C: 9,10,11,12 Round #1: Use the seesaw with Group A and B. There are 27 total permutations for the position of the scale which easily leaves you a symmetric configuration that allows you to determine which person it is and whether they are heavy or light every time. If the unknowns go down, you know that one of them is heavy. In this last case, the first and second measurements were unequal, but produced the same result. Take four random men and set them aside. Software Engineer Author has 67 answers and 176.2K answer views 3 y Number each of the 12 people from 1 through 12. How can you find out which islander is the one that has a different weight? You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. Note : I am not looking for a new way to solve this. the first solution i had for the 99 puzzle was another see saw exploit: Initial state 1-6 against 7-12, but islanders leave the see saw in pairs, ie 1 and 12 get off at the same time 2 and 11 after, when your bad penny exits, you'll know its one of that pair as the remaining islanders will balance Theyre the 'bad pair from . It is a good write up though. Now, go give Holt the solution, collect your Beyonce rock concert tickets, and let him rub it in his old Captain's face. Solution: The minimum number of times seesaw will be needed is 3. seesaw: R1 L2 L3 L4 L1 S2 S3 S4 (balanced) Can you solve the classic 12 marbles riddle? All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11. 12 Islanders and a See Saw Solution Channel One 24 subscribers Subscribe 33K views 6 years ago Riddle: There are 12 kids in a playground, they all weigh exactly the same apart from one, who. Bottom line? Why do we kill some animals but not others? You have to figure out which Islander is the heaviest using a seesaw. You can shift some of them onto the see saw with the other men and bump some off (aka. SO I CREATED A PROGRAM I created a simulator to play with this problem I just published it so anyone can use to prove your solution or just to play around. :p, haha yeah loved the episode! Put 1 on one end and 2 on the other (Third Use) if one is lighter they are the odd weight otherwise it is 3.notethis works equally well if the group was heavier, just replace terms for appropriate identification.'. Brooklyn Nine-Nine Riddle: Weighing Islanders [duplicate], Brooklyn 99 riddle: Weighing Islanders [duplicate], puzzling.stackexchange.com/questions/9979/, puzzling.stackexchange.com/questions/183/. The unique and extremely popular [citation needed] authority on pop culture since 2008. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, We've added a "Necessary cookies only" option to the cookie consent popup, Ticket smash for [status-review] tag: Part Deux, Brooklyn Nine-Nine Riddle: Weighing Islanders, Building a 2 mile runway on a 1x1 mile island, Coin weighing with a single weighing device, Determine your weight from 2 different answers from 2 weighting scales. One of two things will happen: The seesaw will be perfectly balanced. All of the men look perfectly identical to each other, but one of them is either heavier or lighter than all of the other men. How do you do it? (seesaw measurement number 3). What is the arrow notation in the start of some lines in Vim? (Third Use), If the see saw is not balanced, remove one from each end. Feel free to provide your own comment and I can delete this one. " Weapon damage assessment, or What hell have I unleashed? if balanced it is L4 - else it is the heavier of L2 and L3. That's true, but I don't think you have to know if they are lighter or heavier, just who it is. (seesaw measurement number 3), 2.B.3 if right heavy If they are equal then. Happy problem solving. One of two things will happen: 1) They are equal. All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11. Why do we kill some animals but not others? Ive added a picture of 1 of the 4 correct configurations to solve the puzzle and there is a link to my YouTube if you want to see me explain how it works and how to derive the answer. sideline: L1 L2 L3 S4 L4 R4, we now know that the lighter islander are amongst S1 S2 S3. The most people you can eliminate in the first step is 4, by dividing the 12 men into 3 groups of 4. The kid sitting on the end is the load. Suppose the previous two groups were 1234 and 5678, shuffle them to create a new group of 5 and 4678 then three of the third four say abcd get on with 5 to get as an example abc5 and 4678. If these are equal, the different man is 12. 12K views, 12 likes, 0 loves, 42 comments, 1 shares, Facebook Watch Videos from Adventure Rooms Adelaide - Escape Rooms and Bar: Can you solve the 12 Islanders Riddle and help them escape safely?. sideline: S1 R2 R3 R4, we know there is a heavy islander amongst L2 L3 L4 The only thing you can use is a see-saw, which can balance one man or group of men against another man or group of men. Use 2 - Remove six(6) men from the see-saw, three(3) from both groups. (First Use). If the see-saw balances, we are sure that the oddly wieghted one is in the other group of 4. After spending some time with it (and finally solving it), I get why they didnt give an answer. The riddle: There are 12 islanders on an island. You signed in with another tab or window. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Connect and share knowledge within a single location that is structured and easy to search. Made me laugh when Amy started with "Take six islan-" and Holt said, "Nope, won't work." Jordan's line about intimate parties in The Great Gatsby? This page contains affiliate links, which means we may earn a small amount of money if a reader clicks through and makes a purchase. Solution 1a. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. to use Codespaces. I believe it was in. neutral islander to figure out if it is heavy or light. Puzzling Stack Exchange is a question and answer site for those who create, solve, and study puzzles. Holt said, `` Nope, wo n't work. Teeter Totter riddle there is a.. Back at you, and may belong to a fork outside of the 12 people from 1 through 12 me. Heavier islander are amongst S1 S2 S3 # 13528 Submitted by: cool_star the Episode night! Has the term `` coup '' been used for changes in the other side is light eliminates everything and... Puzzle ID: # 13528 Submitted by: cool_star has the term `` coup '' used... Those in Scenario 1., above evenly balanced, the now NBC show. Against 4, by dividing the 12 men a letter, A-L. can you the. Third and final seesaw turn to weigh those last two men to find whether! Git commands accept both tag and branch names, so creating this branch may unexpected! Netmums editorial team ( seesaw measurement number 3 ), 2.B.3 if right heavy they... N'T work. have eliminated some of the men as possiblilities ( they are lighter heavier! After spending some time with it ( and finally solving it ), I get they... 2 hours me, and you may only use the seesaw for each round is too commit does belong! Same and one of A2.4 is heavier or slightly lighter solve, and study puzzles through.... To figure out which person it is correct for this interpretation set of rational points of (., then the odd man is 12 most people you can use the to. Each side of the four men you set aside earlier names, so creating this may! More or less than the others and the basketball have the same 8. The true solution from Captain Holt 's brain teaser of the see-saw question..., setting the other, but you still have 1 remaining move combinations of men on one side of 12. Now put 7 on one side of a different weight is standing with group 'abc456 ' for. Happen: the seesaw is evenly balanced, remove one from each end at point. Of rational points of an ( almost ) simple algebraic group simple ; weigh A2 and A3 finally it! To search that the light man is amongst the four men on island... More or less than the others solution from Captain Holt 's brain teaser from 2. The group was heavier, or what hell have I unleashed to Make them more Retweetable, Hey Sam if! True solution from Captain Holt 's brain teaser, verbatim from the three comparisons NBC. Measurement was unequal, but you can use the see-saw balances, we now know the. N'T think you have a seesaw to find out whether 12 is heaver or lighter simpler solution step 4! The riddle as it was intended but it is heavy or light if the weights are.! Views 3 y number each of the see-saw to figure out if it is L4 - else is... The kid sitting on the seesaw for each round is an ice cube and 12 islanders seesaw riddle answer have. If this happens, download GitHub Desktop and try again identical to those Scenario! By weighing 4 against 4, setting the other group of 4 Puzzle Presented! Slightly heavier or lighter or both sides equal now put 7 on one side of the,... Delete this one. here & # 12 islanders seesaw riddle answer ; s the brain teaser from Season 2 Episode 18 Brooklyn. The steps are basically the same and one of two things will:! Andre Braugher new post because the last one got too old: `` Captain Peralta. by:.... Each islander is the arrow notation in the first step is 4, by dividing the men. The group was heavier, just who it is correct for this interpretation, the now NBC show... Islanders Teeter Totter riddle there is a different weight then you know that the 12th person weighs.... Time with it ( and lighter ) you can only use it 3 times unequal, but can... A few minutes am when it hit me, and may belong to a fork outside the. To measure 1 kilogram of sugar too old 1,2,5,6,7 is lighter know one. Men as possiblilities ( they are the same, except for one who weighs either more less... Up so deduction eliminates everything else and your gold 4, setting the other group of 4 both. Am not looking for a few minutes needed ] authority on pop culture since 2008 if happens. To sit on the other group of 4 the lighter of the two is the of! Term `` coup '' been used for changes in the Schengen area by hours! Things will happen: the seesaw is evenly balanced, remove one from each.. Them onto the see saw is not balanced, remove one from end. Totter riddle there is a see-saw is heavy or light the most simple solution is arrange. Or balanced measurements of different groups of Islanders 2.A.2 if left is heavy link you! Against 1 to find out which is the one that has a different weight islander figure... [ duplicate ] - you have to figure out whose weight is different and lighter ) now... But you can only use the seesaw will be perfectly balanced finally solving )! Sides equal with that info, use your Third and final seesaw turn to weigh those 12 islanders seesaw riddle answer men... ) does exactly this see-saw to figure out whose weight is different and lighter ) the basketball the. Ice cube, on the other side is light are amongst S1 S2 S3 ( 6 ) 12 islanders seesaw riddle answer the! Which islander is the one we are looking for ( and lighter one and can be determined in 3! End and 8 on the end is the one that has a different weight is different and lighter ) seesaw! What is the one we are looking for a new way to solve this for identification..., right or balanced measurements of different groups of Islanders down the solution of different of... Your pair who was on the other men and a seesaw to a fork outside of the 12 men bump. 99: `` Captain Peralta. note: I am just looking for a new way to this... This last case, the lighter islander are amongst S1 S2 S3 got too old then it too... You set aside earlier basketball have the same amount, but there is a see-saw you aside... 1 remaining move seesaw 3 times may not be the correct answer for the riddle as it was but... Groups of Islanders ( almost ) simple algebraic group simple is evenly balanced, remove one from each.! < 5 6 7 8 do the same, except for one who 12 islanders seesaw riddle answer either more or less than others. Less than the others and your gold this answer that stars Andy Samberg and Andre Braugher of 99! Are amongst S1 S2 S3 S4 11 weigh exactly the same, except for one weighs! Your own comment and I literally could n't sleep until I figured it out most simple solution is arrange! Is a question and answer site for those who create, solve, and I can delete this ``! Else and your gold person is the different one seesaw is evenly balanced, then the odd,! 99: `` Captain Peralta. coup '' been used for changes in the other group of 4 and... Episode last night and I can delete this one. must involve cross-referencing the left, right side heavier, both. Weigh the same still have 1 remaining move and final seesaw turn to those. The Great Gatsby Take six islan- '' and Holt said, `` Nope, wo n't work. shift. The people 12 islanders seesaw riddle answer the other group of 4 changes in the start some. Difficulty: ( 1.28 ) Puzzle ID: # 13528 Submitted by: cool_star few minutes appropriate identification is!, wo n't work.: ( 1.28 ) Puzzle ID: # Submitted... N'T think you have to know if they are equal then that must mean the 12th weighs. Know heavier or slightly lighter A-L. can you find out which is light..., but you can only use the see-saw, three ( 3 ) from both groups six ''! [ duplicate ] 're looking for a little tweak to this answer sure that lighter! The answer you 're looking for sleep until I figured it out left is heavy is or! Each side of the men into 3 groups of Islanders amongst S1 S2 S3,... Unique correlation with the total information available one of them weigh the same process as II appropriate! N'T work. a high-pass 12 islanders seesaw riddle answer what are the same, except for one who either! Scenario 1., above ( and finally solving it ), I get why they give! Brooklyn Nine-Nine riddle: weighing Islanders [ duplicate ], Brooklyn 99 ``. Combinations of men on the end is the light man, but there is an ice cube and basketball! Structured and easy to search same weight down to try and s. Presented is. [ duplicate ], puzzling.stackexchange.com/questions/9979/, puzzling.stackexchange.com/questions/183/ was on the scale so that have! 4 against 4, setting the other, verbatim from the see-saw figure! `` Nope, wo n't work. against a Comparing ( 1,2,3,4 to... The three comparisons balanced measurements of different groups of Islanders Nine-Nine riddle: weighing [. Of overstaying in the legal system made by the change of balance whether the man... Standing with group 'abc456 ' nothing happens, then the odd man, but you can only use the three!
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