Please help me solve this word problem

[dlucero1970]

Help me answer this mathquestion: A room is 13ft by 18ft. It needs to be painted. The ceiling is 18ftabove the floor. There are 2 windows in the room; each one is 3ft by 4ft. Thedoor is 3ft by 7ft. One gallon of paint covers 79sq ft. How many gallons areneeded to paint the walls? At $25 per gallon, what is the cost to paint thewalls?

I am so very confused. I know the formula is: A=bh, but that's all I know.

 

[MarkFL]

You have 4 walls, made up of two pairs having the same dimensions at opposite ends of the room. What are the dimensions of the two pairs?