Counterfeit Coins

Logic Level 3

You have 11 piles of coins, with 10 coins in each pile. You know what a single coin should weigh. You also know that one of the piles is made up entirely of counterfeit coins. Each fake coin weighs one gram more than a real one. What is the minimum number of times you would have to weigh the coins to determine which pile has the counterfeits?


This is a slightly modified version of a problem found in Martin Gardner's book "My Best Mathematical and Logic Puzzles".
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