SOLUTION: If 8 men can built a house in 90 days,in how many days can 20 men working under the same conditions as the 8 men built the house?

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Question 906505: If 8 men can built a house in 90 days,in how many days can 20 men working under the same conditions as the 8 men built the house?
Found 2 solutions by josmiceli, richwmiller:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
8 men can built a house in 90 days
1/2 as many men will take twice as long, so:
4 men can built a house in 180 days
5 times as many men will take 1/5 as long, so
20 men can build a house in 36 days

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Here is another method.
The other tutor astutely noticed the common factor of 4.
8*90=720 man days
720/20=36 days for 20 men
Not sure which is easier.