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    Question

    A is five times as efficient as B and can finish a piece

    of work in 24 days less than B. B can finish this work in how many days?
    A 40 days Correct Answer Incorrect Answer
    B 48 days Correct Answer Incorrect Answer
    C 44 days Correct Answer Incorrect Answer
    D 30 days Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Ratio of efficiency of A and B = 5: 1
    A will take 1/5 of time as compared to B.
    Say, B takes 5x days and A takes x days.
    ∴ 5x – x = 24 ⇒ x = 6
    ∴ B takes 6 × 5 = 30 days to do the work.

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