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    Question

    A man is thrice as fast as a women and a woman is twice

    as fast as a boy. If all of them can do a work in 18 days. than a boy can do the work in?
    A 27 days Correct Answer Incorrect Answer
    B 162 days Correct Answer Incorrect Answer
    C 90 days Correct Answer Incorrect Answer
    D 54 days Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Ratio of efficiency of a man ,a woman and a boy = 6:2:1 So let total work =(6+2+1) x 18 = 162 So a boy alone will do it this work in = 162/1 = 162 days

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