a gallon of paint can cover 200 square feet. Find how many gallon containers of paint should be bought to paint 2 coats on each wall of a rectangular room with dimensions 18 feet by 8 feet and walls that are 10-feet tall.
total area to paint 18 x 10 x 2 + 2 x 8 x 10 = 520 ft2
two coats woud = 1040 ft2
1040 ft2 / 200ft2/gal = 5.2 gallons you'll need to buy 6 gallons