A plan for a house is drawn on a 1:40 scale. if the length of the living room on the plan measures 4.5 inches, what is the actual length (in feet) of the built living room?
If the scale is 1:40, it means that 1 inch on the plan represents 40 inches in reality.
Therefore, the actual length of the living room can be found by multiplying the length on the plan (4.5 inches) by the scale factor (40).
Actual length of the living room = 4.5 inches * 40 = <<4.5*40=180>>180 inches.
To convert inches to feet, divide the length in inches by 12 since there are 12 inches in a foot.
Actual length of the living room in feet = 180 inches / 12 = <<180/12=15>>15 feet.
Therefore, the actual length of the built living room is 15 feet.