Posted by: republican January 21, 2007
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Coins puzzle:
You have 10 stacks of coins, each stack containing 10 coins. The coins in 9 of the stacks weigh 100 grams each. The coins in one of the stacks weigh 90 grams each. All 100 coins look identical. Using a weighing scale, can you determine which stack has the lighter coins, if you are allowed to measure the weight only once?