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On this site you'll find lots of logic puzzles and riddles, puzzling riddles,
science puzzles and math puzzles and riddles.

Answers and detailed solutions are included.

Do you know other nice brain teasers, riddles or puzzles that should be on the site?
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logic puzzle

Fake coins

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?

mail puzzle

rating 3.0/5

answer - solution

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Last changed 24-10-2008