the label on a 4L can of paint says that the contents will cover an area of 40m. How many cans are neede to paint the walls and ceiling of a room 7.5m long, 5m wide, and 2.5m tall?
7.5x5 = 37.5 m^2 = area of ceiling
TWO walls are 7.5 x 2.5
TWO walls are 5 x 2.5 Assuming there are no doors or windows, the total is
37.5 + 2(7.5 x 2.5) + 2 (5 x 2.5) =100 m^2 ONE can covers 40 m^2 so you will need MORE than two cans so the answer is THREE cans ...in reality TWO would probably work due to windows and door(s) in the room
