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Vandaag is het 19 September 2018

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Fake coins - logic puzzle

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Suppose you have five bags filled with the same type of coins and a weigthing machine. One of this bags is completely filled with fake coins, the other bags contain only real ones. A real coin weights 10 gram and a fake one 11 gram.
What is the minimal number of times you need to use the weighting machine in order to find the bag with the fake coins?
bag with coins

Answer

With using the weighting machine only once it is possible to find the bag with the fake coins.