Answer:
27 gallons
Step-by-step explanation:
A rectangular room is a rectangular prism. The floor and ceiling are the bases. The walls are the lateral faces. The lateral are of a rectangular prism is the product of the perimeter of the base and the height of the prism.
lateral area = Ph
lateral area = 2(10 ft + 18 ft) × 8 ft
lateral area = 448 ft²
area of walls = 448 ft²
area of three coats = 3 × 448 ft² = 1,344 ft²
area covered by 1 gallon of paint = 50 ft²
number of gallons of paint needed = 1344 ft² / 50 ft² = 26.88
Answer: 27 gallons
