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    Question

    A and B can do a piece of work in 5 days, while C and D

    can do the same work in 20 days. In how many days will A, B, C and D do it together?
    A 3 Correct Answer Incorrect Answer
    B 4 Correct Answer Incorrect Answer
    C 5 Correct Answer Incorrect Answer
    D 6 Correct Answer Incorrect Answer

    Solution

    Let the total work be LCM of 5 and 20 = 20 units. Work done by A+B in 1 day = 1 unit Work done by C+D in 1 day = 4 unit Work done by A+B+C+D in 1 days = 4+1 =5 unit Fraction of work left = (20)/5 =4days.

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