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 tog

1.	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
Answer» B. 7/15

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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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