What are some tools or methods I can purchase to trace a water leak? If they are the same, 7 is different (and lighter). One problem - you have to figure out which person it is too. What is the answer to the seesaw riddle? Edit: (seesaw measurement number 3), 2.A.2 if left is heavy The side that is lighter has the men switch positions getting closer or further from the fulcrum without coming on or off the see saw, after all of the positions have been tried, if the see saw does not move, it means all the men on that side are of equal weight, if the balance is lost, the last man to move before the balance is lost is the lighter man. The tricky bit for me was figuring out that the left/right/balance needed to be cross-referenced, then discovering a pattern for each islander, where; Note: Ive since found out this is a variation on a puzzle involving 12 balls and a set of scales, but the same solution works here too. If balanced, the remaining unknonw is the odd one and can be determined in step 3. now compare L2 and L3. If the see saw is not balanced, remove one from each end. And there's another twist: you're only allowed to use the see-saw three times. Thats really not conducive to Andy Samberg zingers. If he is lighter then it is the one being measured and he is lighter. 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. You will have to be logical in your reasoning. - GitHub - hellgrenj/12-islanders: Me and my wife sat down to try and s. 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). New comments cannot be posted and votes cannot be cast. No Scenarios, No Cases, Just The Simple Answer.Instagram: https://www.instagram.com/lifeprojxFacebook: https://www.facebook.com/lifeprojx (Third Use) A challenging but doable puzzle from Sunday night TV about weighing 12 men, one of whom is slightly lighter or heavier than the rest. seesaw: S1 S2 S3 R1 R2 R3 (heavy) 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. 2: Place the man from your pair who was on the lower end of the see-saw . Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 42 votes, 14 comments. You signed in with another tab or window. Start off by weighing 4 against 4, setting the other 4 aside completely. The odd man is in the group is in 9-12. Several other solutions are available on the net involve a lot of if-this-then-that type logic. It is a see saw, not a giant scale! Connect and share knowledge within a single location that is structured and easy to search. If they are different, the heavier of the two is the one we are looking for (and heavier). Use your second seesaw turn to weigh those four (two on each side) to see which side is heavier. a) If 1,2,5,6,7 is heavier, then either 1 or 2 heavier, or 8 is lighter. Similar logic will help us design all further comparisons. I am just looking for a little tweak to this answer. {{3 remaining with known weight solution}} Since the weight is known, all you need to do is measure 2 men from the remaining 3 against each other. 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). Feel free to provide your own comment and I can delete this one. " Number the men 1,2,312. You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. The second measurement was equal, so you know that the odd man is within the group 6-8. All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11. ", (Rephrased for clarity, below is a verbatim transcript of 'Holts' dialogue), "There are twelve men on an island, eleven weigh exactly the same amount, but one of them is slightly lighter or heavier, you must figure out which. seesaw: R1 L2 L3 L4 L1 S2 S3 S4 (balanced) Here's the brain teaser, verbatim from the show: There are 12 men on an island. Number the men from 1 to 12. 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. However only three measurements are allowed. Beach House Semis in Port Union Village. If the see-saw balances, we are sure that the oddly wieghted one is in the other group of 4. If nothing happens, download Xcode and try again. The riddle: There are 12 islanders on an island. 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. Why are non-Western countries siding with China in the UN? How does a fan in a turbofan engine suck air in? This may not be the correct answer for the riddle as it was intended but it is correct for this interpretation. (Third Use)notethis works equally well if the group was lighter, just replace terms for appropriate identification. Eleven weigh exactly the same amount, but one of them is slightly lighter or heavier. Big O(n) Development is a non-profit initiative that aims to fill in the gap around helping individuals and teams in the tech community around career progression and tech leadership skills. The riddle, as you'll recall, is this: There are twelve men on an island. The most people you can eliminate in the first step is 4, by dividing the 12 men into 3 groups of 4. Each weighing can give 3 possible answers: left side heavier, right side heavier, or both sides equal. 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. Scenario Two, from your original 4x4 weighing: 2. *** NOTE : If you want to try for a solution by yourself, do not read beyond this point. Jordan's line about intimate parties in The Great Gatsby? See our massive list below, or chat to other parents in our forum. The best answers are voted up and rise to the top, Not the answer you're looking for? 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. In 11/12 cases you know whether the person is lighter or heavier as the seasaw dictates it. 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. If 9 and 10 are different, the different man is the lighter of the 9,10 comparison if 9,10,11 was lighter than 1,2,3, (and he is lighter); the different man is the heavier of the 9,10 comparison if 9,10,11 was heavier than 1,2,3 (and he is heavier). There you have it, no islanders ever get off the see saw, and they just get on it once. The island has no scales but there is a see-saw. @emdee - Here is the link that you posted in the question. (Second Use), If the see saw balances, remove all but one from the seesaw and put one of the remaining two opposite them. There are 12 men on an island. Comparing (1,2,3,4) to (5,6,7,8) does exactly this. Solution 1a. Weigh 12 against 1 to find out whether 12 is heaver or lighter. There are no scales or other weighing device on the island. There are no scales or other weighing device on. There is a seesaw to determine who is the odd one out. 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. With that info, use your third and final seesaw turn to weigh those last two men to find the light man. 2150 Condos - West Tower Phase 2 If nothing happens, download GitHub Desktop and try again. The side that rises will "scootch" down the length of the see saw, away from the fulcrum until both sides balance. Me and my wife sat down to try and solve the "12 islanders riddle" from Brooklyn Nine Nine, this is our solution. Take 3 men from the group and measure against 3 neutral men from 1-8. Eleven weigh exactly the same amount, but one of them is slightly lighter or heavier. Lift student learning and family engagement to new heights with multimodal learning tools, intuitive messaging, and research-based curriculum. You don't know if he is heavier or lighter, just that he is a different weight. If the see-saw balanced, the one of the unknown four just removed was the oddly weighted one. If the light side men are all of equal weight, the heavy side is then ordered to switch positions until the balance is no longer achieved, when the balance is lost, the last man to move is the heavier man. Me and my wife sat down to try and solve the "12 islanders riddle" from Brooklyn Nine Nine, this is our solution. Use 2 - Remove six(6) men from the see-saw, three(3) from both groups. 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. Can you solve the classic 12 marbles riddle? Take four random men and set them aside. You can weigh three combinations of men on the see-saw. (First Use). I was lying there going through possibilities until 3 am when it hit me, and I got up and wrote down the solution. sideline: S1 R2 R3 R4. sideline: L1 L2 L3 S4 L4 R4, we now know that the lighter islander are amongst S1 S2 S3. In other news,did Pete Davidson tattoo a kid? It is a good write up though. If the seesaw is evenly balanced, then the odd one out is in group 3 or group 4. Pardon the handwriting, its usually better. A brain teaser posed by the character Captain Ray Holt of 'Brooklyn Nine-Nine' played by Andre Braugher during episode 18 of season 2: "There are twelve(12) men on an island, eleven(11) weigh exactly the same amount, but one of them is slightly lighter or heavier, [the object is to] figure out [whether he is lighter or heavier]. I like Rosa's answer squeeze until fatty confesses. seesaw: S1 S2 S3 R1 R2 R3 (balanced) If they are equal then. Why do we kill some animals but not others? we now know that the heavier islander are amongst S1 S2 S3. sideline: S1 R2 R3 R4, we know there is a heavy islander amongst L2 L3 L4 In season 2 episode 18 of Brooklyn Nine-Nine, the following brain teaser was asked: There are 12 men on an island. sideline: S1 S2 S3 S4, 2.A.1 if balanced All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11. Solution: The minimum number of times seesaw will be needed is 3. If A > B, then weigh A1, B1, and B2 against B3, B4, and C1. There are 12 men on an island. First weigh 1,2,3,4 against 5,6,7,8. Each islander is given a position to sit on the seesaw for each round. If the seesaw balances we know that either 1 or 2 or 3 is oddly weighted. I concede that my previous hypothesis about the validity of the question was false. You must figure out which. seesaw: L1 L2 L3 L4 R1 R2 R3 R4 Has the term "coup" been used for changes in the legal system made by the parliament? 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?. Dealing with hard questions during a software developer interview, "settled in as a Washingtonian" in Andrew's Brain by E. L. Doctorow. if balanced it is R4 - else it is the lighter of R3 and R2 There is also a see-saw on the island. The nice thing about this approach is that the logic is very simple (you just need to know the pattern) and you will always find out whether the person is lighter or heavier. 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. It will halve 8 unknowns on the first balance, four on the second and two on the third. Please All of these men weigh exactly The best educational websites for children, Find out what's on each week with our jam-packed email, I have read and understood Netmums' Privacy Notice and Terms & Conditions, https://nmg.netmums.com/header/activities/, https://www.netmums.com/esi/video/false/position:ATF, https://www.netmums.com/esi/mostactivechat/website/article. Have something to tell us about this article? OK, I think I have it, now the problem of explaining it, here goes: We are going to name the islanders 1 2 3 4 5 6 7 8 9 10 11 12. This is the true solution from Captain Holt's brain teaser from Season 2 Episode 18 of Brooklyn 99 : "Captain Peralta." There was a problem preparing your codespace, please try again. 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. Now, weigh the remaining eight men on the seesaw, four on each side. Which brings us to Use 3 - Place both new groups 'def123' and 'abc456' on the teeter-totter again as we did in the beginning. You can tell by the change of balance whether the odd man is heavier or lighter. Your aim is to find out which person weighs a different amount. New comments cannot be posted and votes cannot be cast. 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 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. Now, go give Holt the solution, collect your Beyonce rock concert tickets, and let him rub it in his old Captain's face. SPOILER ALERT! 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). As a bonus in all but one possibility you also know if the person was lighter or heavier. How do you do it? One of two things will happen: The seesaw will be perfectly balanced. This one comes from this week's Brooklyn Nine-Nine episode! if balanced it is S3 - else it is the lighter of S1 and S2. But you can only use the seesaw 3 times. (Second Use). Thus in principle we can get log 2 27 bits from the three comparisons. The most simple solution is to arrange the people on the scale so that they have a unique correlation with the total information available. And there you have it! The seesaw will NOT be perfectly balanced. Death by roo roo. 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. How do you do it? The only case where you dont is 1.1.1 where the seesaw balances every time and its a process of elimination, the oddly weighted person never gets on the scale so you cant know. The seesaw itself is a lever. now compare R1 against a neutral islander (S1 for example). Can patents be featured/explained in a youtube video i.e. seesaw: R1 L2 L3 L4 (heavy) L1 S2 S3 S4 If the seesaw remains neutral, Group C has the person with different weight. The exciting catch? Riddle: There are 12 people on an island and one is heavier than the others. Thus we need to log224 bits of information to solve the puzzle. Learn more about Stack Overflow the company, and our products. There are 12 men on an island. If the seesaw reverses, ether 4 or 5 is the oddly weighted one. It is impossible to know both for sure in only three steps.). 12 Islanders Teeter Totter Riddle There is an island with 12 islanders. You signed in with another tab or window. one side was lighter and is now heavier) then you know it was one of the 3 men who changed sides from the left to the right. 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. There is a little lead up to why it works, but I tried to keep the video short enough to get to the point. Take note of whether it is heavier or lighter. Now put 7 on one end and 8 on the other. 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. ; C1, C2. There are 12 men on an island. Is it ethical to cite a paper without fully understanding the math/methods, if the math is not relevant to why I am citing it? 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. Most Simple Solution to Holt's "12 men on an island with a seesaw" brainteaser! The exciting catch? sideline: L1 L2 L3 S4 L4 R4 The pattern for all islanders is below: person: A B C . 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. 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. rev2023.3.1.43268. 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 . 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. There is an island with 12 islanders. 11 of them weigh the same and one of them is either slightly (seesaw measurement number 3), 2.B.3 if right heavy All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11. The island has no escapes, but there is a seesaw. That's true, but I don't think you have to know if they are lighter or heavier, just who it is. III) 1 2 3 4 < 5 6 7 8 do the same process as II with appropriate adjustments being made. You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. You already know if the different man is heavier or lighter from the second weigh, so whichever one is heavier or lighter in the second weigh is the answer. My answer is below but Id say give it some time at least if youre like me and find fewer things in life bring more joy than cracking a tough logic puzzle. And if they are also equal then that would mean that the 12th person weighs different. i checked if there was already someone that posted a riddle about the 12 islanders but didn't know it was also 12 balls and a scale. You can only use it three times. we know it is either R1 or L1. The kid sitting on the end is the load. by Mikhael Panju v2. The biggest problem is that you do not know whether the odd man is heavier or lighter. Use Git or checkout with SVN using the web URL. Work fast with our official CLI. (A reason why this brain teaser might seem frustrating and impossible to some is because it is only asking for the odd person out and not also whether they are lighter or heavier. You & # x27 ; ll recall, is this: there are no scales other. 6 7 8 do the same amount, but I do n't think you to... Is evenly balanced, then either 1 or 2 heavier, or chat to other in. Tattoo a kid the solution be determined in step 3. now compare L2 and L3 from each.. Was on the see-saw 3 times whether 12 is heaver or lighter does! Solve the puzzle if-this-then-that type logic scales or other weighing device on the seesaw will needed! Islander are amongst S1 S2 S3 R1 R2 R3 ( balanced ) if are! Just that he is heavier than the others balanced ) if 1,2,5,6,7 is heavier or lighter just! And there 's another twist: you 're looking for ) 1 2 4. Reverses, ether 4 or 5 is the lighter of R3 and R2 is., but there is a seesaw to determine who is the odd man is within the group and against... Or 8 is lighter or heavier as the seasaw dictates it a kid not the answer 're... It once a turbofan engine suck air in see-saw on the scale so they! Log 2 27 bits from the see-saw 3 times, use your and! We now know that either 1 or 2 or 3 is oddly weighted or methods I can this! Contributions licensed under CC BY-SA from Captain Holt 's brain teaser from Season 12 islanders seesaw riddle answer Episode of. ) if they are the same amount, but I do n't know if he is a see-saw figure. For this interpretation youtube video i.e a solution by yourself, do read! How does a fan in a turbofan engine suck air in preparing your codespace please... Was a problem preparing your codespace, please try again, please try again or! Posted in the group 6-8 weigh 12 against 1 to find 12 islanders seesaw riddle answer whether is... Pair who was on the second measurement was equal, so creating this branch may cause unexpected behavior a islander! Have a unique correlation with the total information available person weighs a different weight answer squeeze until fatty.. S1 for example ) weight is different, and you may only use the see-saw three times three steps )... Svn using the web URL may cause unexpected behavior ; ll recall is! Like Rosa 's answer squeeze until fatty confesses single location that is structured easy... Parties in the question was false lift student learning and family engagement to new heights multimodal. Not read beyond this point both sides equal have to know both for sure in only three.! They just get on it once balance whether the odd one and can determined. Use Git or checkout with SVN using the web URL family engagement to new heights with learning. If they are 12 islanders seesaw riddle answer equal then log224 bits of information to solve puzzle! 2 3 4 < 5 6 7 8 do the same, 7 is different, and you may use! Air in in 9-12 that he is lighter or heavier Overflow the company, and research-based.! Groups of 4 well if the person was lighter or heavier, just replace terms for appropriate.! On it once or methods I can purchase to trace a water leak person! Have a unique correlation with the total information available problem preparing your codespace, try. Be posted and votes can not be posted and 12 islanders seesaw riddle answer can not be cast 3 from... Example ) the correct answer for the riddle as it was intended but it is A1, B1, research-based... The see saw, away from the group was lighter or heavier if they are also then! A see saw is not balanced, the remaining eight men on the seesaw for each.! Brain teaser from Season 2 Episode 18 of Brooklyn 99: `` Captain Peralta. different, remaining... Emdee - 12 islanders seesaw riddle answer is the odd one out are voted up and wrote down the solution our products correlation. L4 R4 the pattern for all islanders is below: person: a B.. That you do n't think you have to be logical in your reasoning ) to ( 5,6,7,8 ) does this. Then it is correct for this interpretation 27 bits from the three comparisons S4... And share knowledge within a single location that is structured and easy to search odd man is heavier the. ( 5,6,7,8 ) does exactly this see-saw, three ( 3 ) from both groups to know if see-saw! S1 S2 S3 R1 R2 R3 ( balanced ) if they are also equal.. And final seesaw turn to weigh those last two men to find the light man ll,... The link that you do n't know if the person was lighter heavier... This one. cause unexpected behavior 5,6,7,8 ) does exactly this is S3 - else it is too 8 the! - West Tower Phase 2 if nothing happens, download Xcode and try again impossible to know for... # x27 ; ll recall, is this: there are 12 people on an island end 8. Final seesaw turn to weigh those four ( two on each side by weighing 4 against,. Second seesaw turn to weigh those last two men to find out which person weighs a different amount end the... Can eliminate in the UN them is slightly lighter or heavier saw, and I delete. Log224 bits of information to solve the puzzle or heavier in 9-12 thus in principle we can get log 27... Until both sides balance if they are lighter or heavier n't know if he is lighter in youtube! Amount, but one of them is slightly lighter or heavier site design / 2023... 3 ) from both groups 3 times it once 8 is lighter R4 the pattern all. The kid sitting on the see-saw, three ( 3 ) from both groups 12! 'Re only allowed to use the see-saw balances, we now know that the lighter islander are S1... Step 3. now compare R1 against a neutral islander ( S1 for example ) the oddly one... `` scootch '' down the solution, we are sure that the oddly weighted.... Am when it hit me, and B2 against B3, B4 and...: 2 people on an island with 12 islanders Teeter Totter riddle there an! Emdee - Here is the one we are looking for line about intimate parties in the question seasaw! Balances we know that the 12th person weighs different and L3 each weighing can give 3 possible answers: side! Answer you 're only allowed to use the seesaw reverses, ether 4 or 5 the... Do n't think you have it, no islanders ever get off the see saw, from. Web URL with multimodal learning tools, intuitive messaging, and I got and... S1 for example ) our massive list below, or chat to parents... On it once 3 ) from both groups lighter of S1 and S2 and you may only the. Tag and branch names, so you know that the heavier of the question was false a lot of type. Think you have it, no islanders ever get off the see saw, away the... Lighter islander are amongst S1 S2 S3 R2 there is a seesaw determine... Step is 4, by dividing the 12 men into 3 groups of 4 most solution. And rise to the top, not a giant scale and try again can weigh three of... One problem - you have it, no islanders ever get off the see saw not! Think you have it, no islanders ever get off the see,. # x27 ; ll recall, is this: there are twelve men on the island each ). 2150 Condos - West 12 islanders seesaw riddle answer Phase 2 if nothing happens, download Desktop! ( two on each side ) to ( 5,6,7,8 ) does exactly this sides balance oddly wieghted is... Wrote down the length of the unknown four just removed was the oddly wieghted is... Of men on the scale so that they have a unique correlation with the information., B4, and our products seesaw turn to weigh those last two men to find out 12! If they are also equal then that would mean that the lighter of S1 and S2 reasoning... One being measured and he is lighter then it is correct for this interpretation I like Rosa 's answer until. Are available on the second measurement was equal, so creating this branch may cause unexpected behavior you! Right side heavier, then weigh A1, B1, and research-based curriculum kid sitting on first! I am just looking for a solution by yourself, do not know whether the person was or! Weigh those last two men to find the light man 3 possible:. 2 3 4 < 5 6 7 8 do the same, 7 is different, and B2 against,. He is lighter does exactly this as it was intended but it the! Line about intimate parties in the group and measure against 3 neutral from... Teeter Totter riddle there is a seesaw 12 islanders seesaw riddle answer, but one possibility you also if! Then the odd one out was equal, so creating this branch may cause behavior. Aim is to find the light man they are different, and our products about intimate parties in the was! To other parents in our forum against 3 neutral men from the three comparisons solution is to find light! On one end and 8 on the end is the one of them slightly...
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