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    Question

    A is thrice as efficient as B and can finish a piece of work in 28 days less than B. B can finish this work in how many days?

    A 45 days Correct Answer Incorrect Answer
    B 48 days Correct Answer Incorrect Answer
    C 46 days Correct Answer Incorrect Answer
    D 42 days Correct Answer Incorrect Answer
    E 40 days Correct Answer Incorrect Answer

    Solution

    Ratio of efficiencyofA 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 = 28 ⇒ x = 14 ∴ B takes 14 × 3 = 42 days to do the work

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