The answer is g = 21
just multiply the fraction.
3 × 7 is 21.
20 high x 18 long = 360 square feet
3 windows x (4 high x 3 long) = 3 windows x 12 square feet = 36 square feet
360 - 36 (because we obviously don't paint windows) = 324
324 square feet to paint on one wall
Area = 18 = 1/2 x 6 x (h+1)
h=5
