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    Question

    Krishna can do a piece of work in 25 days. He alone

    worked at it for 10 days and then Balram completed alone the rest work in 20 days. In how many days, they will complete the whole work, working together?
    A 16(2/3) days Correct Answer Incorrect Answer
    B 12(1/2) days Correct Answer Incorrect Answer
    C 14(2/7) days Correct Answer Incorrect Answer
    D 12(6/7) days Correct Answer Incorrect Answer

    Solution

    Efficiency of Krishna = 100/25 = 4% Work done by Krishna in 10 days = 10/25 × 100 = 40% Remaining work = 60% Efficiency of Balram = 60/20 = 3% Therefore, required number of days = 100/((4+3)) = 100/7 = 14(2/7) days

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