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    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?
    A 3 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 7 Correct Answer Incorrect Answer
    D 9 Correct Answer Incorrect Answer

    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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