SOLUTION: If it takes 72 minutes for 7 people to paint 8 walls, how long will it take 9 people to paint 5 walls?

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Question 969037: If it takes 72 minutes for 7 people to paint 8 walls, how long will it take 9 people to paint 5 walls?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
If it takes 72 minutes for 7 people to paint 8 walls,
Find how many man-minutes to paint 1 wall
%287%2A72%29%2F8 = 63 man-min per wall
:
how long will it take 9 people to paint 5 walls?
let m = no. of minutes for 9 people to paint 5 walls
9m = 63*5
9m = 315
m = 315/9
m = 35 minutes for 9 people to do 5 walls