Question
30 men can complete a work in 12 days. After 9 days, 15
more men joined them. How many days will they now take to complete the remaining work?Solution
Let, the efficiency of a man = y ATQ- (30 x y x 9) + (45 x y x D) = 30 x y x 12 (45 x y x D) = 360y-270y 45Dy=90y D = 90y/45y D=2 days.
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