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    Question

    A can complete a work in 20 days. B takes 10 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 = 20 – 10 = 10 days Let the total work = 20 units Efficiency of A = 20/20 = 1 units/day Efficiency of B = 20/10 = 2 units/day Required time taken = 0.90 x 20/(1+2) = 6 days

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