Q: A set of 7 spoons costs $21. If each spoon would be sold separately, how much would 5 spoons cost?
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A: A set of 7 spoons costs $21, so one spoon from the set costs 21 / 7 = $<<21/7=3>>3.
So if sold separately, 5 spoons would cost 5 * 3 = $<<5*3=15>>15. The answer is  15.
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