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

Question: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

1.1/4

2.1/10

3.1/15

4.8/15


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