Ryans living room is 10 feet wide, 12 feet long, and 10 feet high. if one gallon of paint covers 400 square feet of surface area, how many gallons of paint would ryan need to paint all four walls and the ceiling? .

We have to calculate the suface of the four walls and the ceiling.
Surface of the four walls=2(10 ft * 10ft ) + 2(12 ft * 10 ft)=200 ft² + 240 ft²=
=440 ft²
Surface of the ceiling=10 ft * 12 ft=120 ft²

Total surface=440 ft² + 120 ft²=560 ft²

Now, we have to caluclate the number of gallons of paint.

1 gallon400 ft²
x560 ft²

x=(1 gallon * 560 ft²) / 400 ft²=1.4 gallons.

Ryan need to paint all four walls and the ceiling 1.4 gallons.