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by William Armstrong
5 Jan 2013
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Heavy Coin Puzzle

Genre: Logic Puzzle Rating: 3 - Easy to Medium Source: Unknown
Brain Functions: Analysis, Logic Hint    Solution

You have a pile of 27 coins. Twenty-six of these coins have the same weight, and one is heavier. Your task is to determine which coin is heavier and do so in the minimum number of weighings. You are given a beam balance (scale), which will compare the weight of any two sets of coins out of the total set of 27 coins. How many weighings are required to identify the heavier coin?

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