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Thu 23 Jul, 2009 05:24 am
1. You have 11 stacks of 50p coins, each stack consisting of 10 coins. One entire stack is counterfeit and each counterfeit coin weighs one gram more than it should. You know a genuine 50p coin weighs 8 grams. What is the least number of weighings needed to determine which stack is counterfeit?
@sophocles,
Please will you stop asking GFQ questions on here - the organiser has requested it several times and so have contestants. Try and find the answer yourself - more satisfying don't you think?
@sophocles,
You always cheat and in fact 8grams is not mentioned in the clue!
You have never helped a single person with an answer. Just take take take.
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