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

A group of 10 students completes a project in 6 hours. How long will a group of 15 students finish?

10 students ........ 6 hours

1 student ........ 6 x 10 = 60 hours

15 students ........ 60 : 15 = 4 hours

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