Create an account to follow your favorite communities and start taking part in conversations. Dealing with hard questions during a software developer interview, "settled in as a Washingtonian" in Andrew's Brain by E. L. Doctorow. 2150 Condos - West Tower Phase 2. Comparing (1,2,3,4) to (5,6,7,8) does exactly this. Can a VGA monitor be connected to parallel port? The best answers are voted up and rise to the top, Not the answer you're looking for? You can only use it three times.. You have to figure out which Islander is the heaviest using a seesaw. 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? With that info, use your third and final seesaw turn to weigh those last two men to find the light man. we know it is either R1 or L1. sideline: S1 R2 R3 R4, we know that the light islander is amongst R2 R3 R4 I believe it was in. It is a see saw, not a giant scale! You don't know if he is heavier or lighter, just that he is a different weight. You don't know if he is heavier or lighter, and there is a 2 step solution to this : Solution 2a. Weigh 9,10,11 against 1,2,3. If balanced it is the heavy L1 else if unbalanced it is light R1. (First Use). Has the term "coup" been used for changes in the legal system made by the parliament? If not balanced, the one going down is heavy. That person is the heavier (or lighter). But you can only use the seesaw 3 times. Here is a more precise retelling of the riddle we found. The essence of the riddle is: "There are 12 men on an island. Weigh 12 against 1 to find out whether 12 is heaver or lighter. Drift correction for sensor readings using a high-pass filter. The exciting catch? Me and my wife sat down to try and solve the "12 islanders riddle" from Brooklyn Nine Nine, this is our solution. There was a problem preparing your codespace, please try again. Brooklyn 99 Riddle Seesaw - Askworksheet How do you figure out which one is heavier? Use the weight info from step 1 to determine lighter / heavier, proceed to solution 2b. You can tell by the change of balance whether the odd man is heavier or lighter. Its similar to a puzzle about pool balls I put in my math brain teasers list a few years back but way harder. There are 12 men on an island. How does a fan in a turbofan engine suck air in? 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? The riddle, as you'll recall, is this: There are twelve men on an island. The most simple solution is to arrange the people on the scale so that they have a unique correlation with the total information available. If nothing happens, download GitHub Desktop and try again. Bottom line? Similar logic will help us design all further comparisons. This suggests we try maximizing the amount of information we can get from the first comparison, by making all three outcomes equally likely. 12 Islanders Teeter Totter Riddle There is an island with 12 islanders. Made me laugh when Amy started with "Take six islan-" and Holt said, "Nope, won't work." - GitHub - hellgrenj/12-islanders: Me and my wife sat down to try and s. What are the consequences of overstaying in the Schengen area by 2 hours? Solution 1a. 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. Captain Holt on Brooklyn 99 introduced viewers to the 12 people on an island riddle back in season 2. Feel free to provide your own comment and I can delete this one. " run a simulation: go run . 11 weigh exactly the same, but one of them is slightly lighter or heavier. Eleven weigh exactly the same amount, but one of them is slightly lighter or heavier. 12 men live on an island. The See-Saw. (Third Use) Are there basic weighing puzzles requiring adaptive strategies? You signed in with another tab or window. Start off by weighing 4 against 4, setting the other 4 aside completely. Eleven weigh exactly the same amount, but one of them is slightly lighter or heavier. Scenario Two, from your original 4x4 weighing: 2. seesaw: R1 L2 L3 L4 (heavy) L1 S2 S3 S4 [9, 10, 11] VS. [1, 2, 3]. You cannot determine lighter, heavier, proceed to solution 2c. It only takes a minute to sign up. 2) They are different. Why are non-Western countries siding with China in the UN? It only takes a minute to sign up. 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. Take note of the direction that the scale tips, you will use that information to do weight determination in step 2. IF the measurement is equal then the odd man is 12. Note : I am not looking for a new way to solve this. 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. Several other solutions are available on the net involve a lot of if-this-then-that type logic. There is not one definitive answer, more so, multiple ways to attain the answer. Thus in principle we can get log 2 27 bits from the three comparisons. Puzzling Stack Exchange is a question and answer site for those who create, solve, and study puzzles. If balanced, the 3rd unknown is heavy. All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11. (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. seesaw: L1 L2 L3 L4 R1 R2 R3 R4 (balanced) One of two things will happen: 1) They are equal. 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. 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 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. 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. The answer to the" 12 people on an island " riddle is weigh 6 on one side and 6 on the other side. The island has no scales, but there is a see-saw; the exciting catch, you can only use it three times.". if balanced it is L4 - else it is the heavier of L2 and L3. 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. Connect and share knowledge within a single location that is structured and easy to search. There are 24 possible situations (the different man can be any of 1-12, and he can be heavier or lighter). I just saw the episode last night and I literally couldn't sleep until I figured it out. Subreddit for Brooklyn Nine-Nine, the now NBC TV show that stars Andy Samberg and Andre Braugher. Use 2 - Remove six(6) men from the see-saw, three(3) from both groups. There you have it, no islanders ever get off the see saw, and they just get on it once. 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. The seesaw will balance perfectly. You must figure out which. Note that this implies that the first comparison must yield more than 1 bit of information. 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. I am just looking for a little tweak to this answer. 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. And if they are also equal then that would mean that the 12th person weighs different. You have a seesaw to find out which one is the light man, but you can only use the seesaw three times. If they are equal, A4 is heavier. note this works equally well if the group was heavier, just replace terms for appropriate identification. 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. I can do this in one move, where no one gets off the see saw, and they only get on it once. 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). 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. There are 12 men on an island. If the seesaw balances we know that either 1 or 2 or 3 is oddly weighted. So in principle, we should be able to solve the problem. a) If 1,2,5,6,7 is heavier, then either 1 or 2 heavier, or 8 is lighter. Why do we kill some animals but not others? 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. I was lying there going through possibilities until 3 am when it hit me, and I got up and wrote down the solution. And there you have it! neutral islander to figure out if it is heavy or light. 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. 11 of them weigh the same and one of them is either slightly heavier or slightly lighter. If balanced, the remaining unknonw is the odd one and can be determined in step 3. All of these men weigh exactly 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. Is it possible to measure 1 kilogram of sugar? sorry my bad. 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. We know {9,10,11,12} all weigh the same. There are no scales or other weighing device on. Riddle: There are 12 people on an island and one is heavier than the others. if balanced it is R4 - else it is the lighter of R3 and R2 @Corvus has adequately explained the complex solution so as to remove any doubt of this. New comments cannot be posted and votes cannot be cast. Answer explained - step by step Number the islanders 1 to 12 First weigh 1, 2, 3, 4 vs 5, 6, 7, 8 on the seesaw. Press J to jump to the feed. One of two things will happen: The seesaw will be perfectly balanced. by Mikhael Panju v2. With the total information available, setting the other 4 aside completely a?! 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