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 gallon------------------------400 ft²
x----------------------------------560 ft²
x=(1 gallon 560 ft²) / 400 ft²=1.4 gallons.
answer: Ryan need to paint all four walls and the ceiling 1.4 gallons.
