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    Question

    A can complete 1/4th of a work in 5 days while B can

    complete 1/5th of the same work in 6 days. In how many days both of them together can complete the whole work?
    A 12 days Correct Answer Incorrect Answer
    B 8 days Correct Answer Incorrect Answer
    C 6 days Correct Answer Incorrect Answer
    D 9 days Correct Answer Incorrect Answer

    Solution

    To complete the whole work, time taken by
    A = 5 X 4 = 20 days
    B = 5 X 6 = 30 days
    Time taken by both of them together
    => (20 * 30)/(20 + 30) = 12 days

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