Correct option (a) 170/3 days
Explanation:
Let a man can do 1 unit/day.
Total work = 40men×40days=1600 units
40 men can do the work in 10 days = 400 units
According to question, (5 men left after 10 days)
35 men can do the work in 10 days = 350 units
30 men can do the work in 10 days = 300
25 men can do the work in 10 days = 250
20 men can do the work in 10 days = 200
Men left 20-5 = 15 and work left = 1600- 1500 = 100 units they will complete in
