Find The Remaining Work ? If

A can do a work in 10 days and B in 20 days. If they together work on it for 5 days, then the fraction of the work that it left is:

  1. 1/4
  2. 3/4
  3. 3/20
  4. 4/3
Anurag Mishra Professor Asked on 14th August 2015 in Maths.
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  • 1 Answer(s)

    Answer: (1) 1 /4

    Explanation:-
    A can do a work = 10 days
    A can do work in a day = 1/10

    B can do a work  = 20 days
    B can work in a day = 1/20

    A and B together can work in a day = 1 / 10 + 1/ 20
    = (2 + 1)/20
    = 3/20

    Therefore, A and B together can do work in 5 days = 3 x 5/20
    = 3/4

    The remaining work = 1 – 3/4
    = (4 – 3)/4
    = 1/ 4

    Hence, the answer is (1) 1/4.

    Anurag Mishra Professor Answered on 14th August 2015.
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