Mathematics-Measurement-My-Test-05

This problem is related to which competency?

Susan wants to paint her entire room, except for the floor. The length of the room is 12 feet, the width is 8 feet and the height is 10 feet. There are two windows in her room, each measuring 2 feet wide by 3 feet tall. If a gallon of paint will cover 32 square feet, how many gallons of paint will Susan need to paint her room?