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<p>[QUOTE=&quot;Dougmeister, post: 2184636, member: 56842&quot;]<b>RAY</b>: This puzzler came to us from Clive Woods. Clive writes:</p><p><br /></p><blockquote><p><i>“I work in the Anti-Counterfeit Department of the U.S. Treasury. The other day, my assistant was sent 100 U.S. quarters, and he found that 10 of them were booooogus.</i></p><p><i><br /></i></p><p><i>“He sorted the 10 bogus coins into one pile, and being an organized sort of chap, he made 9 piles, each containing 10 of the real coins. The weight of the counterfeit coins in this case was different from the weight of a real quarter by 1 gram. However, he forgot whether it was 1 gram more or 1 gram less, but, he knew that the bogus coins were all 1 gram heavier or 1 gram lighter than the real coins.</i></p><p><i><br /></i></p><p><i>“He was called away to another job, and he left the 10 piles on his desk. I had to determine which was the bogus pile. To do it, I had a calibrated scale that would tell me the weight placed on it within a fraction of a gram. The question is, how could I figure which was the pile of bogus coins in one weighing?”</i></p></blockquote><p><br /></p><p><a href="http://www.cartalk.com/content/counterfeit-quarters?question" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.cartalk.com/content/counterfeit-quarters?question" rel="nofollow">http://www.cartalk.com/content/counterfeit-quarters?question</a>[/QUOTE]</p><p><br /></p>

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