Question
18 men can finish a work in 15 days by working 8 hours
a day. How many more men are needed to finish the work in 12 days by working 6 hours a day?Solution
Let the efficiency of a man be 'x' units/day. Let number of extra men needed to finish the work be 'y'. ATQ; Total work = (18 + y) × x × 12 × 6 = 18 × x × 15 × 8 Or, 18 + y = 30 So, y = 30 − 18 = 12 Therefore, the number of extra men required = y = 12
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