If 70 men can work in 35 days, 40 men complete this work in days?

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If 70 men can work in 35 days, 40 men complete this work in days? Answer: 61.25

Find how many man-days to complete the road: 70*35 = 2450 man-days Let d = days required for 40 men to do it. 40d = 2450 d= 40/2450 =61.25