A homeowner called in a painter to paint the bedroom walls and ceiling. The bedroom is 15 ft. long, 12 ft. wide, and 10 ft. high. The room has two doors each 3 ft. by 8 ft. and three windows each 3 ft. by 5 ft. The doors and windows do not have to be painted. A gallon of paint can cover 300 square feet. How many gallons of paint must he use? Show all of your steps