Hi

Let x represent paint needed to paint a wall 5 meters by 20 meters (100m^2

Question Sets Up a Proportion: 1 gallon of paint will cover 40 square meters

    |cross multiplying to solve for x

    40x = 100

      x = 2.5 gal, paint needed to paint a wall 100 m^2



CHECKING our Answer***

1/40 = .025 = 2.5/100  

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