Posted by heatherly on Wednesday, November 11, 2009 at 11:49pm.
A room measures 15 ft by 19 ft. The ceiling is 10 ft above the floor. The door is 3 ft by 7 ft. A gallon
of paint will cover 78.2 ft2. How many gallons of paint are needed to paint the room (including the
ceiling and not including the door). Round your answer up to the next whole number.

math  DrBob222, Thursday, November 12, 2009 at 12:04am
Two walls are 15' x 10' = 150+150 ft^2.
Two walls are 19' x 10' = 190+190 ft^2
The door subtracts 3' x 7' = 21 ft^2
Add (and subtract) to obtain the final area, then divide by 78.2 to obtain gallons needed. check my work. 
math  Becky, Saturday, November 21, 2009 at 10:02pm
What about the ceiling, Should you add another 15x19 area then divide by 78.2 to get the amount of gallons needed?

math  candy, Tuesday, July 12, 2011 at 3:19pm
so approx. 9 gal.