【正确答案】 D

【答案解析】You are given that the length of the floor is 12 feet, and that the length is 3 more than the width. Set the width equal to w, and set up an equation to find the width.
3+w=12
w=9
To calculate the area, multiply the length by the width.
12×9=108
The area of the kitchen floor is 108 square feet.