Linked Questions

14
votes
3answers
974k views

Brooklyn 99 riddle: Weighing Islanders [duplicate]

This one comes from this week's Brooklyn Nine-Nine episode! There is an island with 12 islanders. All of the islanders individually weigh exactly the same amount, except for one, who either weighs ...
3
votes
2answers
112k views

Brooklyn Nine-Nine Riddle: Weighing Islanders [duplicate]

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 ...
-1
votes
1answer
21k views

The 12 islander question [duplicate]

There is an island with 12 islanders. All of the islanders individually weigh exactly the same amount, except for one (either weigh more, or less than the other 11). How can you find which islander is ...
0
votes
4answers
185 views

How many ways to iterate? [duplicate]

There are 9 coins, out of which one is odd, i.e. its weight is either less or more than that of the other 8 coins. How many iterations of weighing using a pan balance are required to find the odd coin ...
-4
votes
2answers
257 views

Shortest number of attempts to solve this issue [duplicate]

There are 9 identical balls but only one of them has a higher weight. You are also given a weight balance. How many attempts would you require to identify the ball with the extra weight and how?
0
votes
1answer
386 views

Brooklyn nine nine 12 man riddle island [duplicate]

Surely the question is of two men on a see saw at a time as is conventional rather than a makeshift pivot scale making the question much harder as it is 12 men 11 of which are equal weight and one is ...
-2
votes
1answer
137 views

This weighs heavily on my mind [duplicate]

I have 9 coins that look identical, but one is heavier than the others. I want to identify that one. My brother has an old-fashioned balance scale that I can use, but I'll have to do annoying chores ...
0
votes
0answers
74 views

Analytical puzzle [duplicate]

You have twelve coins. You know that one is fake. The only thing that distinguishes the fake coin from the real coins is that its weight is imperceptibly different. You have a perfectly balanced scale....
0
votes
0answers
66 views

Identify the special one among 12 coins [duplicate]

We have 12 coins, and only 11 of them have the same mass. It can be assumed that all coins have identical appearances. We have a lever. How can we identify the special coin, by taking measurements ...
24
votes
4answers
8k views

How do you solve a word puzzle when you have no idea where to start?

When you're looking at a logical word puzzle, what sorts of clues should you try to look for to solve them? There have been quite a few puzzles posted to this site so far that I spent a few minutes ...
7
votes
11answers
3k views

121 coins and a balance

Inspired by this puzzle... You have $121$ apparently identical gold coins. At most one of these is fake, and weighs a different amount than a genuine coin. In front of you is balance with two pans. ...
16
votes
4answers
945 views

Fifty-two genuine and two fake coins

In the country Borgonia, there are only two types of coins: genuine ones and fake ones. All genuine coins have the same weight, and all fake coins have the same weight. The weight of a genuine coin is ...
11
votes
6answers
750 views

Lots of Gold Stacks and a Balance Scale

You are given X amount of stacks of golden coins, each stack consisting of ten (10) golden coins and a digital balance scale with perfect precision that shows how much difference between weights you ...
9
votes
7answers
2k views

Fewest possible weighings to determine which ball is heavier/lighter

You are given 4 balls, all equal in weight except for one that is either heavier or lighter. You are also given a two-pan balance to use. In each use of the balance you may put any number of the 4 ...
10
votes
4answers
8k views

N balls and a scale

The question of twelve balls and a scale is probably the best-known example of the "find the ball of a different weight" problem. But does it generalize? Is there a general way to find a weighing ...

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