Hi,

 if it takes 5 quarts to paint a 10m by 30m wall(300m^2 area), 

how many quarts will it take to paint a 30m by 90m(2700m^2 area) wall

Let x be the number of qts needed for 2700m^2 wall.



Question sets Up the Proportion

  5/300 = x/2700   | Cross Multiplying 

  300x = 5*2700

     x = 5*2700/300

     x = 45 qt



CHECKING our Answer***

1/60 = 45/2700 



 

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