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which would you say is heavier, a kilogram of cotton or a kilogram of gold??

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which would you say is heavier, a kilogram of cotton or a kilogram of gold??
posted Oct 29, 2014 by Kumar Shishir

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+1 vote

We have 12 coins and a balance. 11 coins are of the same weight, but one coin differs in weight (note that you do not know whether the coin with different weight is heavier or lighter!). You may perform three weighings to find out which coin has a different weight, and whether this coin is heavier or lighter.

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 are 9 similar balls. Eight of them weigh the same and the ninth is a bit heavier.
How would you identify the heavier ball if you could use a two-pan balance scale only twice?

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