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It takes 63 minutes for 4 people to paint 9 walls. How many minutes does it take 7 people to paint 4 walls?

 Apr 18, 2020
 #1
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Hello Guest! 

We can use unit rates for the problem.

63 minutes: 4 people: 9 walls

63*4 mins: 1 person: 9 walls

63*4/9 mins: 1 person: 1 wall

28 mins: 1 person: 1 wall.

This is the unit rate. 

Then it takes 7 people 4 minutes to paint 1 wall.

For 4 walls, 4*4= 16 minutes for 7 people to paint 4 walls. 

I hope this helps Guest.

smiley

 Apr 18, 2020
 #2
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If 4 people work 63 minutes each, they have worked a total of 4 x 63 =  252 minutes.

 

They got 9 walls painted, so each wall took  252 / 9  =  28 minutes.

 

If you have 4 walls, it will take 4 x 28  =  112 minutes.

 

You have 7 people, so each person will paint for 112 / 7  =  16 minutes.

 Apr 18, 2020

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