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How can you find out which islander is the one that has a different weight?

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There is an island with 12 islanders. All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11.

You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. There are no scales or other weighing device on the island.

How can you find out which islander is the one that has a different weight?

posted Jul 9, 2019 by Kuldeep Apte

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There are 12 people and a seesaw on an island, and you have the following information:

  • There is one islander who weighs differently than the other 11, but you don't know which one, nor if they are heavier or lighter.
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How should you perform these three weighings to find out which coin has a different weight, and whether this coin is heavier or lighter?

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There is a boat which can only support 80 kilos weight transport. A man has 2 sons. Man weighs 80 kilos and both sons are 40 and 40 kilos. They want to go to the Island with this boat, but going there together adds up to 160 kilos? What should they do to get them all on the Island?

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