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    Question

    A work can be completed by β€˜A’ and β€˜B’, alone in

    12 days and 14 days, respectively. Find the number of days taken by β€˜C’ to complete the same work alone if β€˜A’, β€˜B’ and β€˜C’ together can complete the whole work in 3 days.
    A 5.6 days Correct Answer Incorrect Answer
    B 3.6 days Correct Answer Incorrect Answer
    C 4.6 days Correct Answer Incorrect Answer
    D 2.6 days Correct Answer Incorrect Answer

    Solution

    Let total work = 84 units (LCM of 12 and 14) Efficiency of β€˜A’ = (84/12) = 7 units/day Efficiency of β€˜B’ = (84/14) = 6 units/day Combined efficiency of β€˜A’, β€˜B’ and β€˜C’ = (84/3) = 28 units/day Efficiency of β€˜C’ = 28 – (7 + 6) = 15 units/day Required time taken = (84/15) = 5.6 days

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