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    Question

    A and B together do a job in 12 days. A alone does it in

    20 days. How many days for B alone?
    A 18 days Correct Answer Incorrect Answer
    B 30 days Correct Answer Incorrect Answer
    C 45 days Correct Answer Incorrect Answer
    D 12 days Correct Answer Incorrect Answer

    Solution

    ATQ, 1/12 – 1/20 = (5 – 3)/60 = 1/30 B = 30 days

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