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). 5/15

B). 6/15

C). 7/15

D). 8/15

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