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. 1/4
B. 1/10
C. 7/15
D. 8/15
A. 1/4
B. 1/10
C. 7/15
D. 8/15
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