New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A and B together can complete a work in 12 days, and B

    alone can complete it in 20 days. How many days will A take to complete the work alone?
    A 15 days Correct Answer Incorrect Answer
    B 18 days Correct Answer Incorrect Answer
    C 30 days Correct Answer Incorrect Answer
    D 25 days Correct Answer Incorrect Answer

    Solution

    Work done by A and B in one day = 1/12. Work done by B alone in one day = 1/20. Work done by A alone in one day = 1/12 - 1/20 = (5 - 3) / 60 = 2/60 = 1/30. A will take 30 days to complete the work alone. Correct Option: c

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