Question
25 men can finish a work in 8 days by working 9 hours a
day. How many more men are needed to finish the work in 10 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 = (25 + y) × x × 10 × 6 = 25 × x × 8 × 9 Or, 25 + y = 30 So, y = 30 − 25 = 5 Therefore, the number of extra men required = y = 5
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