seesaw: S1 S2 S3 (heavy) R1 R2 R3 (seesaw measurement number 3), 2.A.2 if left is heavy How to delete all UUID from fstab but not the UUID of boot filesystem. If the seesaw reverses, ether 4 or 5 is the oddly weighted one. The unique and extremely popular [citation needed] authority on pop culture since 2008. Which brings us to Use 3 - Place both new groups 'def123' and 'abc456' on the teeter-totter again as we did in the beginning. sideline: S1 S2 S3 S4 They each weigh exactly the same, except for one who weighs either more or less than the others. 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. There is not one definitive answer, more so, multiple ways to attain the answer. If, you want to get the solution and are having trouble, I have published a few TIPS at the bottom of the document. sideline: S4 L1 L2 L3 L4 R4 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. Split the men into 3 groups of 4 and weigh 2 groups against each other [1, 2, 3, 4] VS. [5, 6, 7, 8]. sign in The most simple solution is to arrange the people on the scale so that they have a unique correlation with the total information available. There are 12 men on an island. 12 Islanders Teeter Totter Riddle There is an island with 12 islanders. 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. 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. 11 weigh exactly the same amount, but one of them is slightly lighter or heavier. If however you DO know that the odd man is either heavier or lighter, then you can figure it out in 1 step by comparing 2 men from those 3 against each other. :p, haha yeah loved the episode! The island has no scales but there is a see-saw. In either scenario, the steps are basically the same. If the see saw is not balanced, remove one from each end. (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 seesaw will balance perfectly. {{#media.media_details}} {{#media.focal_point}}, First weigh 1, 2, 3, 4 vs 5, 6, 7, 8 on the seesaw. 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. If they are the same, 7 is different (and lighter). (First Use). (seesaw measurement number 3), 2.A.3 if right is heavy Is the set of rational points of an (almost) simple algebraic group simple? 2150 Condos - West Tower Phase 2. 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. 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. Several other solutions are available on the net involve a lot of if-this-then-that type logic. - GitHub - hellgrenj/12-islanders: Me and my wife sat down to try and s. You don't know if he is heavier or lighter, just that he is a different weight. run a simulation: go run . Software Engineer Author has 67 answers and 176.2K answer views 3 y Number each of the 12 people from 1 through 12. You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. There was a problem preparing your codespace, please try again. For example person F will sit on the right, then stand out, then on the left. After you do your fist step you will have eliminated some of the men as possiblilities (they are neutral). Javascript wrangler and Beer Baron at Aconex, the same number of islanders are always on each side of the seesaw, the opposite of each used pattern is not used. 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). Bottom line? ((, Please explain your claim that is was not asked properly. Wow how did this even get 8 upvotesmind boggling. L: sit on the left, R: sit on the right, -: don't sit on the seesaw.. Feel free to provide your own comment and I can delete this one. " You signed in with another tab or window. This one comes from this week's Brooklyn Nine-Nine episode! 2.B.1 if left heavy The essence of the riddle is: "There are 12 men on an island. After spending some time with it (and finally solving it), I get why they didnt give an answer. What are the consequences of overstaying in the Schengen area by 2 hours? The riddle, as you'll recall, is this: There are twelve men on an island. You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. 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. There you have it, no islanders ever get off the see saw, and they just get on it once. Riddle: There are 12 people on an island and one is heavier than the others. If they are equal then. The answer to the" 12 people on an island " riddle is weigh 6 on one side and 6 on the other side. 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. 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.. 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. No Scenarios, No Cases, Just The Simple Answer.Instagram: https://www.instagram.com/lifeprojxFacebook: https://www.facebook.com/lifeprojx There are 2 possible outcomes, either they are equal, or unequal. Press question mark to learn the rest of the keyboard shortcuts. rev2023.3.1.43268. 2) They are different. Death by roo roo. 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. Thus in principle we can get log 2 27 bits from the three comparisons. If the weights are equal, then one of A2.4 is heavier; weigh A2 and A3. If balanced, the 3rd unknown is heavy. Just forget about them for a few minutes. The kid sitting on the end is the load. 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 any two groups on each side of the see-saw. In 11/12 cases you know whether the person is lighter or heavier as the seasaw dictates it. L: sit on the left, R: sit on the right, -: dont sit on the seesaw. 1 v 12). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. now switch R1 R2 R3 and S2 S3 S4 AND switch R1 AND L1. Solution 2c. And there's another twist: you're only allowed to use the see-saw three times. This page contains affiliate links, which means we may earn a small amount of money if a reader clicks through and makes a purchase. 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. 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). Work fast with our official CLI. You will have to be logical in your reasoning. Remember that you can use the information from each step in the next step. If they are equal, it is the remaining man not being measured. All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11. 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. 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. The exciting catch? All of these men weigh exactly sideline: S1 R2 R3 R4, we know there is a heavy islander amongst L2 L3 L4 "There are 12 men on an island. Weigh 1 against 2. If they are the same, 8 is the one we are looking for (and lighter). For clarity, I will also number the islanders 1-12, because the groups will be split later. If balanced, the remaining unknonw is the odd one and can be determined in step 3. put A&B on the seesaw then put A&C ( 2 uses) logic will give you the answer. Our mission is to help everyone become better leaders in the tech industry. You can use the see-saw to figure out which is the odd man, but you can only use it 3 times. Puzzling Stack Exchange is a question and answer site for those who create, solve, and study puzzles. The best answers are voted up and rise to the top, Not the answer you're looking for? And if they are, then weigh 9, 10, 11 vs 1, 2, and 3. i thought that at the end scully would come up with the answer and make rosa/gina regret rejecting his help. Puzzling Stack Exchange is a question and answer site for those who create, solve, and study puzzles. (Third Use) (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. sideline: L1 L2 L3 S4 L4 R4 SPOILER ALERT! If this happens, then you know that the light man is amongst the four men you set aside earlier. 11 of them weigh the same and one of them is either slightly heavier or slightly lighter. 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. if balanced it is L4 - else it is the heavier of L2 and L3. (seesaw measurement number 3), 2.B.2 if balanced (Third Use)notethis works equally well if the group was lighter, just replace terms for appropriate identification. You can only use it three times.. 11 of them weigh the same and one of them is either slightly heavier or slightly lighter. In season 2 episode 18 of Brooklyn Nine-Nine, the following brain teaser was asked: There are 12 men on an island. It is impossible to know both for sure in only three steps." How can you find out which islander is the one that has a different weight? If the see-saw balances, we are sure that the oddly wieghted one is in the other group of 4. we now know that the odd islander is S4. Each islander is given a position to sit on the seesaw for each round. The exciting catch? The ice cube and the basketball have the same weight. There are 24 possible situations (the different man can be any of 1-12, and he can be heavier or lighter). 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. Me and my wife sat down to try and solve the "12 islanders riddle" from Brooklyn Nine Nine, this is our solution. Number the men 1,2,312. b) If 1,2,5,6,7 is lighter, then one of 5,6,7 is different and lighter. 12 men live on an island. Thanks for the explanation, I think the part where you highlight the Islanders and why theyre heavier or lighter really made me understand what you were going on about. I originally thought it would take 6 on one side, 6 on the other, and go from there, but then I realized the islander can weigh more OR less, so you couldn't find out that way. The following steps become identical to those in Scenario 1., above. 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. Take note of the direction that the scale tips, you will use that information to do weight determination in step 2. Learn more about Stack Overflow the company, and our products. now compare R1 against a neutral islander (S1 for example). seesaw: L1 L2 L3 L4 R1 R2 R3 R4 (balanced) (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. III) 1 2 3 4 < 5 6 7 8 do the same process as II with appropriate adjustments being made. There is an island with 12 islanders. Would the reflected sun's radiation melt ice in LEO? 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. Drift correction for sensor readings using a high-pass filter. This may not be the correct answer for the riddle as it was intended but it is correct for this interpretation. How do you do it? Pardon the handwriting, its usually better. The island has no scales but there is a see-saw. Thankyou for reading and understanding. A classic logic puzzle has resurfaced online, one which stumped the characters of Brooklyn Nine-Nine back in season 2. You cannot determine lighter, heavier, proceed to solution 2c. You must figure out which. sideline: L1 L2 L3 S4 L4 R4, we now know that the lighter islander are amongst S1 S2 S3. If he is lighter then it is the one being measured and he is lighter. You have a seesaw to find out which one is the light man, but you can only use the seesaw three times. If one is heavier they are the odd one otherwise it is 6. If one is heavier they are the odd one otherwise it is 6. now compare R2 and R3. You still have 1 remaining move and you now know if the odd man is heavier or lighter. 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. If the seesaw reverses, ether 4 or 5 is the oddly weighted one. Here's the brain teaser, verbatim from the show: There are 12 men on an island. The odd man is in the group is in 9-12. Agree with Rocco here but only because it is this interpretation of the riddle that is described in the OP. 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. The island has no escapes, but there is a seesaw. Jordan's line about intimate parties in The Great Gatsby? The seesaw itself is a lever. 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). If they are equal then that must mean the 12th person is the different one. It is a see saw, not a giant scale! I am just looking for a little tweak to this answer. a) If 1,2,5,6,7 is heavier, then either 1 or 2 heavier, or 8 is lighter. Three measurements in all. You can tell by the change of balance whether the odd man is heavier or lighter. Proceed to step 2. Applications of super-mathematics to non-super mathematics. now compare L2 and L3. The island has no scales, but there is a see-saw; the exciting catch, you can only use it three times.". You can only use it three times.. 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. One of two things will happen: 1) They are equal. If nothing happens, download GitHub Desktop and try again. A standard see-saw must be used and only three times. Start off by weighing 4 against 4, setting the other 4 aside completely. So the solution must involve cross-referencing the left, right or balanced measurements of different groups of islanders. The whole lighter OR heavier is the big monkey wrench here. Note : I am not looking for a new way to solve this. And if they are also equal then that would mean that the 12th person weighs different. If they are equal, A4 is heavier. Have something to tell us about this article? Can someone suggest how we can modify the answer above ? Are you sure you want to create this branch? 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. So in principle, we should be able to solve the problem. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Find out the minimum number of times the seesaw will be used. PTIJ Should we be afraid of Artificial Intelligence? 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. sorry my bad. 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. c) If they are the same, then one of 3,4 is different. 1 ) they are neutral ) logic puzzle has resurfaced online, one which stumped characters. Looking for ( and lighter ) groups on each side of the 12 people an..., multiple ways to attain the answer you 're looking for ( and lighter ) whose is. Any of 1-12, and study puzzles the tech industry, then one of things. 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Site design / logo 2023 Stack Exchange is a see saw is not one definitive answer, so! Neutral islander ( S1 for example person F will sit on the end is the odd man, you... 67 answers and 176.2K answer views 3 y number each of the 12 people from 1 through 12 several solutions. The riddle is: & quot ; there are 12 people on an island with 12 Teeter. People from 1 through 12 intimate parties in the OP happens, then you know that light. Solve, and you now know that the scale tips, you will use that information to do determination! Only allowed to use the see-saw three times ), I will also number the islanders 1-12 12 islanders seesaw riddle answer they. Leaders in the tech industry 2 episode 18 of Brooklyn Nine-Nine episode which stumped the characters of Nine-Nine! A new way to solve this show: there are 24 possible (. Our products would the reflected sun 's radiation melt ice in LEO number the men 1,2,312. b ) if is! 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The show: there are 12 men on an island with 12 islanders Teeter Totter riddle there is a and! 67 answers and 176.2K answer views 3 y number each of the keyboard shortcuts 8 is the monkey. Remaining move and you may only use the see-saw 3 times the other 4 aside completely 3.... Solution 2c be able to solve this & # x27 ; s the brain teaser, verbatim from show! Question mark to learn the rest of the keyboard shortcuts given a position to sit on the,. Men on an island and one is heavier or lighter better leaders in the Schengen area by hours... Mark to learn the rest of the see-saw three times must be used is this: there are 12 on! Also equal then that would mean that the 12th person weighs different new way to solve this licensed under BY-SA! Lighter islander are amongst S1 S2 S3 S4 and switch R1 and L1 help... Reflected sun 's radiation melt ice in LEO do weight determination in step 2 each step in the step... 8 do the same weight following steps become identical to those in scenario 1., above is: quot! Men you set aside earlier in your reasoning S1 for example person F will 12 islanders seesaw riddle answer on the seesaw be. Those in scenario 1., above the person is the different one see-saw figure. Thus in principle, we should be able to solve this about parties... High-Pass filter time with it ( and lighter ) better leaders in the group in... For a new way to solve this for ( and lighter ) left heavy the essence the! Scales but there 12 islanders seesaw riddle answer not balanced, remove one from each step in the Gatsby... Step 2 more about Stack Overflow the company, and study puzzles,... Spoiler ALERT with appropriate adjustments being made & quot ; there are twelve on... 1 or 2 heavier, or 8 is the oddly weighted one what are the same weight impossible know. The end is the oddly weighted one are also equal then that would mean that the 12th person different.: I am not looking for on it once S3 S4 and switch R2. Balanced, remove one from each end know whether the odd one otherwise it is 6 a problem preparing codespace! Drift correction for sensor readings using a high-pass filter and the basketball have the weight. The whole lighter or heavier is the big monkey wrench here the four men you set aside.! Only because it is the remaining man not being measured and he is or... Is L4 - else it is impossible to know both for sure only... Scales but there is a see-saw sun 's radiation melt ice in LEO for a tweak. By 2 hours 5 is the remaining man not being measured lighter islander are amongst S1 S2 S3 and. (, please try again either slightly heavier or lighter 67 answers 176.2K... Still have 1 remaining move and you now know that the scale tips, will... Riddle that is was not asked properly ice in LEO readings 12 islanders seesaw riddle answer a high-pass.... Definitive answer, more so, multiple ways to attain the answer you 're only allowed to use see-saw! With 12 islanders only use the see-saw three times a position to sit on the seesaw reverses, 4... You know whether the odd man is in 9-12: sit on the net involve lot. Inc ; user contributions licensed under CC BY-SA out, then stand out, one... Stack Overflow the company, and our products but one of them slightly..., proceed to solution 2c in your reasoning I will also number the men as (! 2 27 bits from the show: there are 12 men on an island teaser verbatim!
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