A set of 7 spoons costs $21. If each spoon would be sold separately, how much would 5 spoons cost? Give me reasons, before answering the question
A set of 7 spoons costs $21, so one spoon from the set costs 21 / 7 = $3. So if sold separately, 5 spoons would cost 5 * 3 = $15. So the final answer is 15.