45 men can do work in 30 days. After 10 days 15 men leave the work and the remaining men work. After 15 days from the start, how many more men are needed to complete the work at the proper time?
1
35
2
20
3
30
4
40
45 men can do work in 30 days. After 10 days 15 men leave the work and the remaining men work. After 15 days from the start, how many more men are needed to complete the work at the proper time?