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    Question

    A alone can do a piece of work in 10 days and B alone in

    15 days. In how many days will they finish the work together?
    A 2 days Correct Answer Incorrect Answer
    B 6 days Correct Answer Incorrect Answer
    C 8 days Correct Answer Incorrect Answer
    D 10 days Correct Answer Incorrect Answer

    Solution

    ATQ, A's 1-day work = 1/10 B's 1-day work = 1/15 Together in 1 day = 1/10 + 1/15 LCM of 10 and 15 = 30 1/10 = 3/30, 1/15 = 2/30 Total = (3 + 2)/30 = 5/30 = 1/6 So time = 6 days

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