A can complete a task in 15 days, whereas B can do it in 20 days. If they work on it jointly for four days, the remaining proportion of the job is:
A. 1/4
B. 1/10
C. 7/15
D. 8/15
Answer:D
A can complete a task in 15 days, whereas B can do it in 20 days. If they work on it jointly for four days, the remaining proportion of the job is:
A. 1/4 B. 1/10 C. 7/15 D. 8/15