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The method of reduction is based on comparing the sizes of the problem with the same size.

A pool is filled with 6 pumps in 12 hours. Because two pumps were damaged, how many hours will take 4 pumps to fill the pool?

6 pumps ........ 12 hours

1 pump ........ 12 x 6 = 72 hours

4 pumps ........ 72 : 4 = 18 hours

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