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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8/15
1 day work of A=1/15
1 day work of B=1/20
Total work in a day=7/60
Work in 4 days=28/60
=7/15
Left work=8/15
1 day work of A=1/15
1 day work of B=1/20
Total work in a day=7/60
Work in 4 days=28/60
=7/15
Left work=8/15
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