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    Question

    A is thrice as efficient as B and can finish a piece of

    work in 20 days less than B. B can finish this work in how many days?
    A 50 days Correct Answer Incorrect Answer
    B 30 days Correct Answer Incorrect Answer
    C 22 days Correct Answer Incorrect Answer
    D 20 days Correct Answer Incorrect Answer

    Solution

    Ratio of efficiency of A and B = 3: 1
    A will take 1/3 of time as compared to B.
    Say, B takes 3x days and A takes x days.
    ∴ 3x – x = 20 ⇒ x = 10
    ∴ B takes 10 × 3 = 30 days to do the work.

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