Melinda wants to paint the exterior lateral surface of her house. It is 9 feet high and has a perimeter of 140 feet. Each gallon of paint covers 300 square feet. How many one-gallon cans of paint does she need to buy to paint her house?
sq ft of the house 9 ft x 140 ft = 1260 ft2
1260 ft2 / 300 ft2/gal = 4.2 gal she will need to buy 5 cans of paint.