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
Answer:D
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