A painter is going to paint a room shaped like a cube with square walls that are 20 feet on each side a gallon of paint can be used to cover 400 ft.² how many gallons of paint should the painter by if he is going to paint the four walls of the room

Answer 1

The total surface area of the four walls in the room would be 4 times the area of one wall. The area of one wall is given by the formula:

A = s²,

where A is the wall's area and s is the side length.

In this case, the side length of the walls is 20 feet. So, the area of one wall is:

A = (20 ft)² = 400 ft².

To find the total area of the four walls, we multiply the area of one wall by 4:

Total area = 400 ft² * 4 = 1600 ft².

Since a gallon of paint can cover 400 ft², the painter should buy:

1600 ft² / 400 ft²/gallon = 4 gallons of paint.

Therefore, the painter should buy 4 gallons of paint.