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

 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

A).  8/15

B). 7/15

C). 4/3

D). 1/7

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