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    Question

    A can complete a work in 12 days and B in 18 days. They

    work together for 6 days, then B leaves. How many total days to finish the work?
    A 2 days Correct Answer Incorrect Answer
    B 8 days Correct Answer Incorrect Answer
    C 5 days Correct Answer Incorrect Answer
    D 10 days Correct Answer Incorrect Answer

    Solution

    ATQ, (A+B) rate = 1/12 + 1/18 = 5/36 Work in 6 days = 6├Ч5/36 = 5/6 Remaining = 1/6 AтАЩs rate = 1/12 Time = (1/6)/(1/12) = 2 days Total = 6 + 2 = 8 days

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