14. Where did the dollar go? Three people had lunch, paid 30 dollars (10 dollars each), and left. After some time, the cook noticed that he had overcharged them by 5 dollars and sent the apprentice to return the money. The apprentice gave back 3 dollars (1 dollar to each person), and kept 2 dollars for himself. Three times 9 dollars plus the 2 dollars the apprentice kept equals 29 dollars. Where did the dollar go?

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14. The dollar, in fact, didn't go anywhere. Let's do the calculation. The meal cost 25 dollars, the boy kept 2 dollars for himself, so the meal cost the customers 27 dollars. They were refunded 3 dollars. For the calculation to be correct, you need to add 3 dollars to the 27 dollars, not 2. Everything adds up.