Five combers

Five combers harvest 12 rows of strawberries in 4 hours. How many rows of strawberries will two combers harvest in 10 hours?

Correct result:

r =  12

Solution:

r=12⋅ 2⋅ 105⋅ 4=12r=12 \cdot \ \dfrac{ 2 \cdot \ 10 }{ 5 \cdot \ 4 }=12

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