The scale Debbie used was 1 inch = 3 feet. That means that every inch Debbie draws represents 3 feet.
Debbie drew a room that was 4 inches (wide, I'm assuming). That means you need to multiply 3 feet by 4 (for every inch that she drew):
[tex]3 feet \times 4 = 12 feet[/tex]
The width of the room is 12 feet.
