# Gold coin problem. Itâ€™s tricky and confusing.?

Suppose You have 5 stacks with 20 supposedly gold coins in each stack. Each authentic gold coin weighs 10 grams, but two of the stacks are composed of only counterfeit coins weighing 11 grams each. You are given a scale the weighs grams. Figure out a way to determine the counterfeit stacks in one weighing using the scale.

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