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The method of reduction is based on comparing the sizes of the problem with the same size.
10 farmers collect in 4 hours 80 kg of apples. If 12 farmers come to work the next day, how many kg of apples do they collect in 3 hours?
10 farmers ........ 4 hours ........ 80 kg
10 farmers ........ 1 hour ........ 80 : 4 = 20 kg
1 farmer ........ 1 hour ........ 20 : 10 = 2 kg
12 farmers ........ 1 hour ........ 12 x 2 kg = 24 kg
12 farmers ........ 3 hours ........ 24 x 3 = 72 kg
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