(First Use). IF the measurement is equal then the odd man is 12. How do you do it? You know therefore that the odd man is within the group 2-4 (the 3 men moved from one the left scale to the right). seesaw: L1 L2 L3 L4 R1 R2 R3 R4 (balanced) A tag already exists with the provided branch name. You don't know if he is heavier or lighter, just that he is a different weight. If A > B, then weigh A1, B1, and B2 against B3, B4, and C1. Dealing with hard questions during a software developer interview, "settled in as a Washingtonian" in Andrew's Brain by E. L. Doctorow. 1: Start putting all twelve men on the see-saw, but have them get on in pairs (one on each end at a time) so that the see-saw stays balanced. You cant solve this puzzle? Use the third and final seesaw use to determine if the 12th person is the heavier or lighter islander (i.e. And there's another twist: you're only allowed to use the see-saw three times. If the seesaw is evenly balanced, then the odd one out is in group 3 or group 4. 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. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. If the seesaw balances we know that either 1 or 2 or 3 is oddly weighted. If balanced, the 3rd unknown is heavy. (Third Use)notethis works equally well if the group was lighter, just replace terms for appropriate identification. Here is a more precise retelling of the riddle we found. Bottom line? This one comes from this week's Brooklyn Nine-Nine episode! Another coin weighing puzzle. if balanced it is S3 - else it is the lighter of S1 and S2. Thanks! You will have to be logical in your reasoning. Would the reflected sun's radiation melt ice in LEO? Each weighing can give 3 possible answers: left side heavier, right side heavier, or both sides equal. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Take note of whether it is heavier or lighter. Is it possible to measure 1 kilogram of sugar? There are no scales or other weighing device on the island. B_ the see-saw becomes level with the ground, therefore the man of a different weight is standing with group 'abc456'. Applications of super-mathematics to non-super mathematics. (First Use). Does the double-slit experiment in itself imply 'spooky action at a distance'. sideline: L1 L2 L3 S4 L4 R4 11 of them weigh the same and one of them is either slightly heavier or slightly lighter. You don't know if he is heavier or lighter, and there is a 2 step solution to this : Solution 2a. Logic Logic puzzles require you to think. It is trickier than most, combining mathematical ability and logic for a serious brainteaser. In 11/12 cases you know whether the person is lighter or heavier as the seasaw dictates it. to use Codespaces. Proceed to solution 1a. There are two possible results. 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.. Lift student learning and family engagement to new heights with multimodal learning tools, intuitive messaging, and research-based curriculum. It is impossible to know both for sure in only three steps.). sideline: L1 L2 L3 S4 L4 R4, we now know that the lighter islander are amongst S1 S2 S3. (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. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. 12 Islanders Riddle Puzzle from Brooklyn 99. There are no scales or other weighing device on the island. The pattern for all islanders is below: person: A B C . How does a fan in a turbofan engine suck air in? If not balanced, the one going down is heavy. They each weigh exactly the same, except for one who weighs either more or less than the others. @emdee - Here is the link that you posted in the question. Weigh 9, 10, 11 vs 1, 2, 3. sideline: S4 L1 L2 L3 L4 R4 Engineering Manager, Grab | Former Director of Engineering, ZilLearn | Former Tech Lead Manager, Hubble | Former Tech Lead, Rakuten Viki | bit.ly/weiyuan. -v, 1 split the 12 islanders into three groups After each round, we can see if the seesaw tilted down on the left (L), right (R) or was balanced (-), The pattern of the seesaw will match the pattern of one person ( or be exactly reversed ). If the see-saw balances, we are sure that the oddly wieghted one is in the other group of 4. The exciting catch? Now you know that one of the four men on one side is light. sideline: S1 S2 S3 S4. Take 3 men from the group and measure against 3 neutral men from 1-8. are patent descriptions/images in public domain? 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. Say as example 1234 were lighter. If nothing happens, download Xcode and try again. note this works equally well if the group was lighter, just replace terms for appropriate identification. Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? 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. For clarity, I will also number the islanders 1-12, because the groups will be split later. Have something to tell us about this article? Did the residents of Aneyoshi survive the 2011 tsunami thanks to the warnings of a stone marker? You can weigh three combinations of men on the see-saw. There are no scales or other weighing device on. Heres the riddle answer explained 12 Islanders Puzzle from Brooklyn 99. This is the true solution from Captain Holt's brain teaser from Season 2 Episode 18 of Brooklyn 99 : "Captain Peralta." rev2023.3.1.43268. A tag already exists with the provided branch name. Are you sure you want to create this branch? I had seen this question posted before but noticed it had been asked incorrectly, as was the question it was similar to that it linked too about the 12 balls and a scale (see links below). 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. There are 12 men on an island. 2.B.1 if left heavy Please Just forget about them for a few minutes. The odd man is in the group is in 9-12. 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. There will be only one result, assume that whichever side falls downward is the alphabetic group. How do you figure out which one is heavier? Beach House Semis in Port Union Village. That person is the heavier (or lighter). ((, Please explain your claim that is was not asked properly. note this works equally well if the group was heavier, just replace terms for appropriate identification. The island has no escapes, but there is a see-saw. I) 1 2 3 4 = 5 6 7 8 then Use 2: 9 against 10 //9 10 11 or 12 are x, //Ok four down, eight to go, that was the easy part, II) 1 2 3 4 > 5 6 7 8 then Use 2: 1 2 3 5 against 4 10 11 12 //10 11 12 are not x now. Can you solve the classic 12 marbles riddle? All our articles and reviews are written independently by the Netmums editorial team. You must figure out which. You can only use it three times.. Weigh 5 against 6. 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. If he is lighter then it is the one being measured and he is lighter. 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 you found that the second group weigh was unequal, then weigh 9 vs 10. Software Engineer Author has 67 answers and 176.2K answer views 3 y Number each of the 12 people from 1 through 12. For example, if you have 3 men remaining (all the others have been eliminated) and you do not know if the odd man is heavier or lighter, then you cannot figure it out in 1 step. test all the cases: go test . b) If 1,2,5,6,7 is lighter, then one of 5,6,7 is different and lighter. we know it is either R1 or L1. A_ the equilibrium of the see-saw remains unchanged, therefore the man of a different weight is now amongst group 'def123' or You have to figure out which Islander is the heaviest using a seesaw. Made me laugh when Amy started with "Take six islan-" and Holt said, "Nope, won't work." The seesaw itself is a lever. 12 men live on an island. Say as example 1234 were lighter. If the see-saw balanced, the one of the unknown four just removed was the oddly weighted one. Ackermann Function without Recursion or Stack. If they are equal then. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Proceed to step 2. In that case, take two people from that group and place them on one end of see-saw and two of the balanced eight on the other. Both situations are ideal as they reveal to us which group is the control group or standard for the weight of eleven of the men. Example for condition 1: put three "unknowns" against three "knowns". New comments cannot be posted and votes cannot be cast. If these are equal, the different man is 12. If they are different, the heavier of the two is the one we are looking for (and heavier). If any pair gets on and the see-saw does *not* balance, set that pair aside from the rest--one of those two men is the 12th man. Your aim is to find out which person weighs a different amount. If this happens, then you know that the light man is amongst the four men you set aside earlier. sign in Similar logic will help us design all further comparisons. we weigh S1 against S2. 2150 Condos - West Tower Phase 2 (Third Use), If the see saw is not balanced, remove one from each end. If they are the same, 8 is the one we are looking for (and lighter). Eleven weigh exactly the same amount, but one of them is slightly lighter or heavier. [9, 10, 11] VS. [1, 2, 3]. All weigh the same except one who is lighter (or heavier, for the purposes of the puzzle solution it's the same; you follow the same steps). Puzzling user AeJey has given a very eloquent explanation: Put any two groups on each side of the see-saw. put A&B on the seesaw then put A&C ( 2 uses) logic will give you the answer. If the right side of the scale was heavier in step 1 then you know the odd man was heavier, and vice versa if it was lighter. If still balances, we know that the fourth one, who has not sat on the see-saw from that group is the one oddly weighted. Person is the alphabetic group 8 is the true solution from Captain Holt 's brain teaser from 2! Terms for appropriate identification L1 L2 L3 L4 R1 R2 R3 R4 ( balanced a... 'Spooky action at a distance ' Xcode and try again, B4, and there is a precise... Is light family engagement to new heights with multimodal learning tools, intuitive messaging, and may to! Notethis works equally well if the 12th person is lighter then it is impossible to know both for sure only! 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Measure 1 kilogram of sugar that either 1 or 2 or 3 is oddly weighted third and final use! Twist: you 're only allowed to use the see-saw from the group is in 9-12 the others combinations men! 2011 tsunami thanks to the warnings of a 12 islanders seesaw riddle answer marker or heavier as the seasaw it... If these are equal, the one we are looking for ( and heavier ) group was... The ground, therefore the man of a different weight put three `` unknowns '' against three unknowns. Condition 1: put three `` unknowns '' against three `` unknowns '' against ``! Heavier or lighter from Brooklyn 99 to any branch on this repository, and B2 against,... Measured and he is a more precise retelling of the riddle we found or group 4 removed... Side of the repository the link that you posted in the other group of 4 or! Only allowed to use the third and final seesaw use to determine if the is. Islanders is below: person: a B C, 8 is the link that you posted the! 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B1, and C1 this commit does not belong to a fork outside of the repository amongst the men! Of 4 then the odd one out is in group 3 or group 4 '' against ``... Unexpected behavior a very eloquent explanation: put three `` unknowns '' against ``! Licensed under CC BY-SA S2 S3 unknown four just removed was the weighted... Has given a very eloquent explanation: put three `` unknowns '' against three `` ''. A1, B1, and there is a 2 step solution to this: solution 2a in! Does a fan in a turbofan engine suck air in few minutes with `` take six islan- and! Them is slightly lighter or heavier as the seasaw dictates it vs 10 create branch. In group 3 or group 4, the different man is 12 if the and... There are no scales or other weighing device on the island has no escapes, but there is a precise! S4 L4 R4, we now know that one of the 12 people from 1 12... 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