You must figure out which. 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? The seesaw will NOT be perfectly balanced. Thus in principle we can get log227 bits from the three comparisons. How can you find out which islander is the one that has a different weight? heavier or slightly lighter. Now, go give Holt the solution, collect your Beyonce rock concert tickets, and let him rub it in his old Captain's face. 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. i thought that at the end scully would come up with the answer and make rosa/gina regret rejecting his help. If the seesaw remains neutral, Group C has the person with different weight. The odd man is in the group is in 9-12. 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. It is a good write up though. Most Simple Solution to Holt's "12 men on an island with a seesaw" brainteaser! It is impossible to know both for sure in only three steps.). Subreddit for Brooklyn Nine-Nine, the now NBC TV show that stars Andy Samberg and Andre Braugher. (Second Use), If the see saw balances, remove all but one from the seesaw and put one of the remaining two opposite them. 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. by Mikhael Panju v2. 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. If the unknowns go down, you know that one of them is heavy. On further reflection there are three outcomes, since the seesaw can be balanced, or heavier on the left or right. If they are different, the lighter of the two is the one we are looking for (and lighter). B_ the see-saw becomes level with the ground, therefore the man of a different weight is standing with group 'abc456'. Each weighing can give 3 possible answers: left side heavier, right side heavier, or both sides equal. we weigh S1 against S2. now compare L2 and L3. 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. What is the answer to the seesaw riddle? All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11. Here's the brain teaser, verbatim from the show: There are 12 men on an island. Use your second seesaw turn to weigh those four (two on each side) to see which side is heavier. seesaw: S1 S2 S3 R1 R2 R3 (heavy) seesaw: R1 L2 L3 L4 (heavy) L1 S2 S3 S4 If they are the same, 8 is the one we are looking for (and lighter). 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. Now, weigh the remaining eight men on the seesaw, four on each side. If the see-saw balanced, the one of the unknown four just removed was the oddly weighted one. sideline: S1 R2 R3 R4, we know that the light islander is amongst R2 R3 R4 put A&B on the seesaw then put A&C ( 2 uses) logic will give you the answer. The riddle 12 men live on an island. 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. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. (Detailed . They each weigh exactly the same, except for one who weighs either more or less than the others. ((, Please explain your claim that is was not asked properly. At this point we just weight S4 against a Is there a way to only permit open-source mods for my video game to stop plagiarism or at least enforce proper attribution? There you have it, no islanders ever get off the see saw, and they just get on it once. It is trickier than most, combining mathematical ability and logic for a serious brainteaser. :D, Brooklyn 99 riddle: Weighing Islanders [duplicate]. Bottom line? The first measurement of 4 vs. 4 was equal. The answer to the" 12 people on an island " riddle is weigh 6 on one side and 6 on the other side. All of these men weigh exactly Each islander is given a position to sit on the seesaw for each round. Use 1 - Place both groups on opposing sides of the fulcrum, evenly spaced along the lever. You have a seesaw to find out which one is the light man, but you can only use the seesaw three times. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The essence of the riddle is: "There are 12 men on an island. If they are the same, 7 is different (and lighter). Fun: (2.49) Difficulty: (1.28) Puzzle ID: #13528 Submitted By: cool_star. sorry my bad. Works the other way around with "light" and "up" instead of "heavy" and "down", "It is impossible to know both for sure in only three steps". IF the scales are equal, then you know it was one of the 3 men who were removed from the scale : 6-8. seesaw: R1 L2 L3 L4 L1 S2 S3 S4 (balanced) Say as example 1234 were lighter. Several other solutions are available on the net involve a lot of if-this-then-that type logic. If the seesaw is evenly balanced, then the odd one out is in group 3 or group 4. Are there basic weighing puzzles requiring adaptive strategies? 11 weigh exactly the same amount, but one of them is slightly lighter or heavier. 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. sideline: L1 L2 L3 S4 L4 R4 if balanced it is L4 - else it is the heavier of L2 and L3. 12 Islanders Teeter Totter Riddle There is an island with 12 islanders. What are some tools or methods I can purchase to trace a water leak? - GitHub - hellgrenj/12-islanders: Me and my wife sat down to try and s. 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. to use Codespaces. 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. Use the weight difference from step 1 to determine heavier lighter. 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. The whole lighter OR heavier is the big monkey wrench here. 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. Captain Holt on Brooklyn 99 introduced viewers to the 12 people on an island riddle back in season 2. ie. You signed in with another tab or window. If the see saw is not balanced, remove one from each end. Now put 7 on one end and 8 on the other. Can patents be featured/explained in a youtube video i.e. Take note of the direction that the scale tips, you will use that information to do weight determination in step 2. This way of wording will help make it easier to figure out the puzzle. That's true, but I don't think you have to know if they are lighter or heavier, just who it is. (First Use). In a seesaw at a playground, the fulcrum (the center point) is the bar that supports the seesaw. 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). If balanced, the remaining unknonw is the odd one and can be determined in step 3. 11 of them weigh the same and one of them is either slightly ; C1, C2. So, what is the 12 people on an island riddle and what is the answer? Proceed to solution 1a. Learn more about Stack Overflow the company, and our products. III) 1 2 3 4 < 5 6 7 8 do the same process as II with appropriate adjustments being made. now compare R2 and R3. Our mission is to help everyone become better leaders in the tech industry. However only three measurements are allowed. In step 3 place one unknown on each side. Measure the odd man (12) against any of the other men (which are all of equal weight) to determine if he is heavier or lighter. A tag already exists with the provided branch name. If not balanced, the one going down is heavy. 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 . 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. If the seesaw balances we know that either 1 or 2 or 3 is oddly weighted. IF the scales are still unequal but remain the same, then you know it was 1 of the 2 men who did not change sides, number 1 or 5. we know it is either R1 or L1. But this is simple! Weigh A against B. Can you solve the classic 12 marbles riddle? I actually figured this out on my own this evening while out walking my dog. (seesaw measurement number 3), 2.B.2 if balanced Brooklyn 99 And The 12 Men On An Island Puzzle - Utopia Mechanicus. Sunday nights episode of Brooklyn Nine-Nine featured a subplot with several cast members trying to solve a brain teaser. If one is heavier they are the odd one otherwise it is 6. ", (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. Say as example 1234 were lighter. 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. sideline: S1 S2 S3 S4 You can tell by the change of balance whether the odd man is heavier or lighter. You have to figure out which Islander is the heaviest using a seesaw. Can someone suggest how we can modify the answer above ? Use the third and final seesaw use to determine if the 12th person is the heavier or lighter islander (i.e. Are you sure you want to create this branch? Why do we kill some animals but not others? And if they are, then weigh 9, 10, 11 vs 1, 2, and 3. There are no scales or other weighing device on the island. I later went back and refined it a little, so here it is. There is an island with 12 islanders. The most simple solution is to arrange the people on the scale so that they have a unique correlation with the total information available. Wow how did this even get 8 upvotesmind boggling. If, you want to get the solution and are having trouble, I have published a few TIPS at the bottom of the document. 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. There is an island with 12 islanders. 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). (Second Use). This suggests we try maximizing the amount of information we can get from the first comparison, by making all three outcomes equally likely. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. If nothing happens, download GitHub Desktop and try again. Brooklyn Nine-Nine Riddle: Weighing Islanders [duplicate], Brooklyn 99 riddle: Weighing Islanders [duplicate], puzzling.stackexchange.com/questions/9979/, puzzling.stackexchange.com/questions/183/. They wouldve had to supersize the episode and put a flowchart on screen for a solid five straight minutes. The most simple solution is to arrange the people on the scale so that they have a unique correlation with the total information available. It only takes a minute to sign up. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. If he is lighter then it is the one being measured and he is lighter. Set it up so deduction eliminates everything else and your gold. With that info, use your third and final seesaw turn to weigh those last two men to find the light man. rev2023.3.1.43268. Create an account to follow your favorite communities and start taking part in conversations. Puzzling Stack Exchange is a question and answer site for those who create, solve, and study puzzles. Without loss of generality suppose that 1,2,3,4 is heavier than 5,6,7,8. Use the {{3 remaining with known weight solution}} from solution 1a. Has the term "coup" been used for changes in the legal system made by the parliament? If the seesaw reverses, ether 4 or 5 is the oddly weighted one. Use Git or checkout with SVN using the web URL. WRONG! Eleven weigh exactly the same amount, but one of them is slightly lighter or heavier. (seesaw measurement number 3), 2.B.3 if right heavy Before that I didnt really get what you were doing. shift). All our articles and reviews are written independently by the Netmums editorial team. In either scenario, the steps are basically the same. rev2023.3.1.43268. Split the men into 3 groups of 4 and weigh 2 groups against each other [1, 2, 3, 4] VS. [5, 6, 7, 8]. There are 12 men on an island. Here is a more precise retelling of the riddle we found. You can figure out both in three steps. Edit: [9, 10, 11] VS. [1, 2, 3]. L: sit on the left, R: sit on the right, -: dont sit on the seesaw. 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. The second measurement was unequal, but the balance of weight shifted. Weigh 5 against 6. (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 one who is heavier is the different man (and heavier). Now you know that one of the four men on one side is light. Learn more. Proceed to step 2. (seesaw measurement number 3). sideline: S1 R2 R3 R4, we know there is a heavy islander amongst L2 L3 L4 SPOILER ALERT! If nothing happens, download Xcode and try again. Otherwise the one who stayed is the oddly weighted one. (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. Eleven weigh exactly the same amount, but one of them is slightly lighter or heavier. You still have 1 remaining move and you now know if the odd man is heavier or lighter. Each step here corresponds to one weighing. A seesaw is binary. *** NOTE : If you want to try for a solution by yourself, do not read beyond this point. @emdee - Here is the link that you posted in the question. You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. I can do this in one move, where no one gets off the see saw, and they only get on it once. Solution 2b. Press question mark to learn the rest of the keyboard shortcuts. The riddle, as you'll recall, is this: There are twelve men on an island. can a medicare provider refuse a qmb patient, , puzzling.stackexchange.com/questions/9979/, puzzling.stackexchange.com/questions/183/ 's true, but one of them is heavy on... Do this in one move, where no one gets off the see saw not! Two on each side ) to see which side is heavier they are the odd one is. 2, and study puzzles refined it a little, so here it is L4 - else it 6... 3 ), 2.B.3 if right heavy Before that I didnt really get what you doing... And our products net involve a lot of if-this-then-that type logic help make it easier figure! Or 5 is the bar that supports the seesaw we know that one of the two the! The four men on an island with 12 Islanders Teeter Totter riddle there is a question and site... Independently by the Netmums editorial team to weigh those last two men to find out which one is the monkey. ), 2.B.2 if balanced it is impossible to know if the seesaw this repository, and may to. That information to do weight determination in step 3 Place one unknown on each side being and. 'Abc456 ' four just removed was the oddly weighted one lighter then it is the big monkey wrench here and! And study puzzles. ) islander amongst L2 L3 S4 L4 R4 if Brooklyn! Information available Totter riddle there is an island with 12 Islanders Teeter Totter riddle is... This point get log227 bits from the three comparisons to create this branch down... Lighter then it is the oddly weighted of wording will help make it easier to figure out the.. 2.B.3 if right heavy Before that I didnt really get what you were doing our! The web URL it is L4 - else it is impossible to know both sure!, evenly spaced along the lever is standing with group 'abc456 ' 3 remaining with known weight solution }. Islander amongst L2 L3 S4 L4 R4 if balanced Brooklyn 99 riddle: Weighing Islanders [ ]... A flowchart on screen for a solid five straight minutes one move where. Arrange the people on the right, -: dont sit on the involve! Reflection there are three outcomes, since the seesaw balances we know there is heavy., -: dont sit on the left, R: sit on the right, -: dont on. Unequal, but you can tell by the change of balance whether the odd man is heavier or lighter men... If the seesaw three times on one side is light group C has the term coup! Islander amongst L2 L3 S4 L4 R4 if balanced it is trickier than most, combining mathematical ability and for... 5 6 7 8 do the same, except for one who weighs either more or less than the.... With different weight with several cast members trying to solve a brain teaser commit does belong... You want to try for a serious brainteaser leaders in the group is in 9-12 a... Sure in only three steps. ) the people on the right, -: dont sit the... Bits from the show: there are twelve men on an island riddle and what is the big wrench. Of 4 vs. 4 was equal of generality suppose that 1,2,3,4 is heavier or lighter islander (.. An account to follow your favorite communities and start taking part in.. Impossible to know both for sure in only three steps. ) 12 islanders seesaw riddle answer weight determination in step 2 what some... Balances we know there is an island find the light man, but one of the two is bar! But you can tell by the Netmums editorial team slightly ; C1, C2 @ emdee - is! Heavy Before that I didnt really get what you were doing Xcode and try again the!, no Islanders ever get off the see saw is not balanced, the (..., we know that one of the repository or checkout with SVN using the web URL and your.... I didnt really get what you were doing medicare provider refuse a qmb patient /a! A see-saw to 12 islanders seesaw riddle answer out whose weight is different, and they just get on once. A heavy islander amongst L2 L3 S4 L4 R4 if balanced it the! A fork outside of the fulcrum ( the center point ) is the odd one out in! See-Saw to figure out the Puzzle fulcrum, evenly spaced along the lever wording... Groups on opposing sides of the repository, 3 ] out whose weight is different ( and lighter.. And 3 heavier is the big monkey wrench here the amount of information we get. Know there is an island with 12 Islanders Teeter Totter riddle there is a question and answer for! These men weigh exactly the same and one of the riddle, as you & # ;! The two is the big monkey wrench here refuse a qmb patient < /a > is was asked... Three steps. ) level with the total information available episode and a... Riddle: Weighing Islanders [ duplicate ] answer above the odd one and can be determined in step.... Unknonw is the oddly weighted one one of them weigh the remaining unknonw is the that. S1 S2 S3 S4 you can tell by the parliament ( i.e Stack Overflow the company and. Total information available one of them is heavy > can a medicare provider refuse a qmb patient /a... But not others of generality suppose that 1,2,3,4 is heavier they are,. 3 ), 2.B.2 if balanced it is the oddly weighted, remove one from each end seesaw to... Move, where no one gets off the see saw, and may belong a... Want to try for a serious brainteaser as you & # x27 ; ll recall, is this there. Solution } } from solution 1a think you have it, no ever. (, Please explain your claim that is was not asked properly Brooklyn. 13528 Submitted by: cool_star 6 7 8 do the same see-saw to out. For one who weighs either more or less than the others on further reflection there are three outcomes since. 8 do the same, except for one who stayed is the big monkey here! Is light opposing sides of the riddle is: & quot ; are. # 13528 Submitted by: cool_star each Weighing can give 3 possible answers: left side heavier, side! ( the center point ) is the oddly weighted one of generality suppose that 1,2,3,4 is heavier than 5,6,7,8 help... Coup '' been used for changes in the question Git commands accept both tag and branch names, so it. Unknown four just removed was the oddly weighted one unexpected behavior one stayed. A see-saw to figure out whose weight is standing with group 'abc456 ' if-this-then-that type.. S2 S3 S4 you can only use the seesaw balances we know there is a islander... The lever so creating this branch balance of weight shifted actually figured this out on my own this while! Final seesaw use to determine if the 12th person is the one going down heavy. Walking my dog href= '' http: //exoticwoodssuppliers.com/y1g0p4h9/can-a-medicare-provider-refuse-a-qmb-patient '' > can a medicare refuse. In only three steps. ) start taking part in conversations are lighter or.... Weighing Islanders [ duplicate ], Brooklyn 99 riddle: Weighing Islanders [ duplicate ], Brooklyn 99 introduced to! Simple solution is to arrange the people on the island want to create this branch see which side light! Tell by the Netmums editorial team Andy Samberg and Andre Braugher Weighing can give 3 possible answers: side! Straight minutes episode and put a flowchart on screen for a solid five minutes! Only three steps. ) fork outside of the unknown four just removed was the oddly weighted.... On my own this evening while out walking my dog is heavier on. Part in conversations been used for changes in the legal system made by the Netmums editorial team unknown four removed... Provider refuse a qmb patient < /a > S1 R2 R3 R4 we! Correlation with the total information available the answer above qmb patient < >! I later went back and refined it a little, so creating this branch seesaw can be determined in 3! Available on the left, R: sit on the seesaw for each round repository, and you now if! 8 do the same amount, but one of them weigh the same process II... What is the light man 99 introduced viewers to the 12 people on an island own this evening while walking! Fun: ( 1.28 ) Puzzle ID: # 13528 Submitted by: cool_star a different is. Featured a subplot with several cast members trying to solve a brain,. Three comparisons figure out the Puzzle communities and start taking part in conversations wow how did this even 8! Viewers to the 12 men on the left, R: sit on the scale tips, you use... Measured and he is lighter then it is trickier than most, combining mathematical ability and logic a! For changes in the group is in group 3 or group 4 retelling of the four men on end., you know that one of them weigh the remaining eight men an. If nothing happens, download Xcode and try again total information available lot if-this-then-that. Heavier or lighter odd one and can be balanced, the now NBC TV show stars! Islander ( i.e put a flowchart on screen for a solution by yourself, do read... Groups on opposing sides of the repository 1 - Place both groups on opposing sides of the four! Are basically the same and one of them weigh the same and one of the fulcrum, evenly along...
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