C alone can complete a piece of work in 15 days while D alone can complete it in 20 days. If C works for 5 days while D works for 10 days, how much fraction of the work is left?
1
3/4
2
1/5
3
1/6
4
2/3
C alone can complete a piece of work in 15 days while D alone can complete it in 20 days. If C works for 5 days while D works for 10 days, how much fraction of the work is left?