Working alone, A can do a piece of work in 72 days, and B in 90 days. If they work together on it for 10 days, then what fraction of the work is still left?
1
1/4
2
3/5
3
1/5
4
3/4
Working alone, A can do a piece of work in 72 days, and B in 90 days. If they work together on it for 10 days, then what fraction of the work is still left?