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    Question

    A can complete a work in 10 days and B in 15 days. They

    work together for 3 days. How much work is left?
    A 3/5 Correct Answer Incorrect Answer
    B 2/5 Correct Answer Incorrect Answer
    C 1/2 Correct Answer Incorrect Answer
    D 1/7 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    A’s 1-day work = 1/10 B’s 1-day work = 1/15 Together 1-day work = 1/10 + 1/15 = 5/30 = 1/6 Work done in 3 days = 3 × 1/6 = 1/2 Remaining work = 1 - 1/2 = 1/2

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