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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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