1. There are 1 10 tables, which have been moved three times. The first time, everyone moved one, the second time, every two people moved one, and the third time, every three people moved one. How many people are there?

1 10/( 1+ 1/2+ 1/3)=60

The milkman only has two cups with the capacity of 5 liters and 3 liters, respectively, for him to take the milk that the customer needs from the cups. How to measure 1 liter of milk with these two cups without wasting it?

3 * 2-5 = 1L

Pour 3-liter cups twice and 5-liter cups in turn. The last of the 3 liters of glass is 1 liter of milk.