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    Question

    A can complete a work in 25 days. B takes 5 days less

    than A to complete the same work. In how many days can both of them together complete 90% of the work together?
    A 8 days Correct Answer Incorrect Answer
    B 6 days Correct Answer Incorrect Answer
    C 10 days Correct Answer Incorrect Answer
    D 12 days Correct Answer Incorrect Answer

    Solution

    Time taken by B to complete the work = 25 – 5 = 20 days Let the total work = 100 units Efficiency of A = 100/25 = 4 units/day Efficiency of B = 100/20 = 5 units/day Required time taken = 0.90 x 100/(4+5) = 10 days

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