A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :
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Work of a =1/15
Work of b = 1/20
Total work that can be done by them
= 1/15 + 1/20 = 7/60
Therefore total work is 60
And the work for 1 day s 7
For 4 days the work done s 7*4=28
Therefore the left work is =60-28 =32
Fraction of work left upon total work =32/60
=8/15
Work of b = 1/20
Total work that can be done by them
= 1/15 + 1/20 = 7/60
Therefore total work is 60
And the work for 1 day s 7
For 4 days the work done s 7*4=28
Therefore the left work is =60-28 =32
Fraction of work left upon total work =32/60
=8/15
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