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    Question

    20 men can finish a work in 12 days by working 7 hours

    a day. How many more men are needed to finish the work in 10 days by working 8 hours a day?
    A 1 Correct Answer Incorrect Answer
    B 2 Correct Answer Incorrect Answer
    C 3 Correct Answer Incorrect Answer
    D 4 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 = (20 + y) ├Ч x ├Ч 10 ├Ч 8 = 20 ├Ч x ├Ч 12 ├Ч 7 Or, 20 + y = 21 So, y = 21 тИТ 20 = 1 Therefore, the number of extra men required = y = 1

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