New RBI Grade B 2025 Notification will come Soon! Enroll Here

    Question

    A can do a job alone in 66 days, B can do it alone in 55

    days, while A, B and C working together can complete the job in 22 days. In how many days can C do the job alone?
    A 82.5 Correct Answer Incorrect Answer
    B 85 Correct Answer Incorrect Answer
    C 81.5 Correct Answer Incorrect Answer
    D 84 Correct Answer Incorrect Answer

    Solution

    LCM (66, 55, 22) = 330 Let the total work be the individual time taken by the workers. Now, total work = 330 units Efficiencies, A does each day = 330/66 = 5 units B does each day = 330/55 = 6 units (A + B + C) together do each day = 330/22 = 15 units Now, C does each day = 15 -(5+ 6) = 4 units Time taken by C to complete the job alone. = 330/4   82.5 days   In 82.5 days, C can do the job alone.

    Practice Next

    Relevant for Exams: