Answer:
12 gallons
Step-by-step explanation:
The perimeter of the room is ...
20 ft + 10 ft + 20 ft + 10 ft = 60 ft
Then the area of the walls is the product of this and their height:
area = (60 ft)(8 f) = 480 ft²
The number of gallons required is ...
(480 ft²)/(40 ft²/gal) = 12 gal
12 gallons of paint are required.
