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It takes 54 minutes for 4 people to paint 6 walls. How many minutes does it take 6 people to paint 7 walls?​

 Mar 19, 2020
 #1
avatar+23553 
+2

54 min * 4 people / 6 walls =   36  min-people/ wall

 

 

36 min-people/wall   x   7 wall/6 people = 42 min

 Mar 19, 2020
 #2
avatar+111360 
+1

If   6 walls can be painted in 54 min.....then 1 wall can be painted in 9 min

 

Which  means that  each person can paint    1 /( 9 * 4)  =  1/36  of the wall in one minute

 

So  6 people can paint  6 (1/36)  = 1/6 of a wall in 1 minute

 

So....the number of  minutes that it would take them to paint  7 walls =  

 

7  / (1/6)    =   7 * 6    = 42  min

 

 

cool cool cool

 Mar 19, 2020

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