This topic belongs to the concept of stealing three people, each 9 yuan, 3×9 = 27 yuan+2 yuan hidden by the waiter =29 yuan ",which is wrong in itself. Looking back at the topic "At first, everyone paid 10 yuan, but now it is returned to 1 yuan, that is, 10- 1 = 9, and each person only spent 9 yuan money. "So, three people spent a * * * in 27 yuan (including 25 yuan's rent and 2 yuan's hidden by the waiter), and in the problem, 27 yuan +2 yuan's way is misleading, so as long as we know how much a * * * spent and where it was spent, the problem will be clear.