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    Question

    A can finish a work in 20 days and B can complete the

    same work in 15 days. B worked for 9 days and left the job. In how many days can A alone finish the remaining work?
    A 10 days Correct Answer Incorrect Answer
    B 8 days Correct Answer Incorrect Answer
    C 9 days Correct Answer Incorrect Answer
    D 7 days Correct Answer Incorrect Answer

    Solution

    A can finish a work=20days. B can complete the same work=15days. LCM of 20 and 15 =60 Let the total work =60 units Efficiency of A =60/20=3 units Efficiency of B =60/15=4 units B worked for 9 days =4×9=36units. Remaining work =60-36 =24. Remaining work done by A =24/3=8days.

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