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    Question

    To do a certain work. the ratio of efficiencies of X

    and Y is 5 : 7. Working together, X and Y can complete the same work in 70 days. X alone started the work and left after 42 days. Y alone will complete the remaining work in:
    A 72 days Correct Answer Incorrect Answer
    B 72 days Correct Answer Incorrect Answer
    C 80 days Correct Answer Incorrect Answer
    D 90 days Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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