Question 103788
1/20 of the work can be done by 5 men in 1 day.
1/20*1/5=1/100 of the job can be done by 1 man in 1 day.
4/100=1/25 of the job can be done by 4 men in 1 day.
So it will take 4 men 25 days to paint the fence.
Ed