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    Question

    A, B, and C, working alone, can complete a job in 16,

    24, and 36 days, respectively. In how many days can they complete the job if they work together?
    A 7(11/19) Correct Answer Incorrect Answer
    B 5(17/19) Correct Answer Incorrect Answer
    C 4(13/19) Correct Answer Incorrect Answer
    D 6(7/19) Correct Answer Incorrect Answer

    Solution

    Using the LCM method, The LCM of 16, 24 and 36 = 144(total work) A's efficiency = 144/16=9 B's efficiency = 144/24=6 C's efficiency = 144/36=4 Time = Total work / Total efficiency Time =144/ (9+6+4) Time =144/19 Time =7(11/19) days.

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