SOLUTION: 4 people can paint 7 walls in 30 minutes. How many minutes will it take for 9 people to paint 9 walls? Round to the nearest minute.

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Question 821884: 4 people can paint 7 walls in 30 minutes.
How many minutes will it take for 9 people to paint 9 walls? Round to the nearest minute.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
4 people can paint 7 walls in 30 minutes.
Find how many man-minutes to paint one wall
%284%2A30%29%2F7 = 17.143 min per wall
:
How many minutes will it take for 9 people to paint 9 walls?
let m = no. min to accomplish this
9m = 9(17.143)
Divide both sides by 9
m = 17.143 ~ 17 minutes