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Question: there are 10 bags of coins containing coins of 10...

Question details

There are 10 bags of coins containing coins of 10 grams each. There is one bag that its coin are fake and they are either one gram heavier or one gram lighter than the real coins in the other bags. The only thing you have is a scale but you are allowed to make only one measurement. How can you tell which bag is the fake one? Expalain.
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