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Solve the math problems of primary school students
1) There are 25 monkeys. (20+5)÷(5-4)=25

2) A hits first, B comes second, and C comes last. The reason is that the last person has to wait for 6 minutes before turning on the water, so the first person and the second person have the shortest time. A hits first, which takes 1 min; It takes 3 minutes to wait and turn on the water for the second call. The shortest time.

3) Not clear