# Math riddle i think the answer is one but am not sure?

ou have ten stacks of 10 half dollar coins. one entire stack is counterfeit but you do not know which one. you do know the weight of a genuine half dollar and you also know that the counterfeit coins are each one gram more than they should be. you may weigh the coins on a deli type scale. what is the smallest number of weighings necessary to determine which stack is counterfeit? Explain your answer.

I think the answer is one but i am not usre

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The smallest number would be two because supposing you happened to weigh the counterfeit stack on the first two tries. The other one would be 10 grams less. The counterfeit 10 grams more. You cannot find it in one weighing because you do not know the absolute weight of the coins only the relative weight and so you need another sample.

2 because you have to way one from each stack!

well, there are 10 counterfeit, and each one is one gram more than the real ones. So, that makes the counterfeit stack 10 grams more than the real ones. So, the smallest number of weighings would be 2 to detemine this.