find area of carpet and subtract from area of living room
2 feet border around all so we have
legnth and width of room is 12 and 10
legnth and width of carpet is (12-2-2) and (10-2-2)
it is minus 2 twice since there are 2 sides of the carpet so
L and W of carpet=8 and 6
so area
area of living room=LW=(12)(10)=120
area of carpet=LW=(8)(6)=48
subtract
120-48=72
area is 72 ft^2 or 72 square feet
