Question 65059


If 6 men can do the piece of work in 14 days, then one man requires (6)(14) or 84 days to do it.  In other words, the job takes 84 man-days

1 man takes 84 days
2 men takes 42 days
4 men takes 21 days

Let x= number of men required to do the job in 21 days

21 times x = number of man-days required to do the job and that equals 84

21x=84
x=4 


Hope this helps.   Happy holidays----ptaylor