F 20 men can build a wall 66 meters long in 6 days, what length of a similar can be built by 86 men in 8 days?
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(1)
Men = 20
Day = 6
Work = 66 m
(2)
Men = 86
Day = 8
Work = ?
= 86*8*66÷20*6
= 43*22
= 946
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