SOLUTION: It takes 20 men 8 days to complete 1/4 of the work. How many men are needed to complete all of the work in 5 days?

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Question 896519: It takes 20 men 8 days to complete 1/4 of the work. How many men are needed to complete all of the work in 5 days?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
After the 20 men after worked 8 days and have finished 1/4 of the job?
20*8=160 man days for 1/4 of the job.
We need to do 3/4 of the job to finish the job.
3*160=480
480/5=96 total men to finish the job in 5 days.
You already have 20 men
96-20=76 more men
96 men total so you need to get another 76 men
or
from the beginning?
20*8=160 for 1/4 of the job.
for the whole job 160*4=640
640/5=128
128