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  3. The length of a rectangular kitchen floor is 3 feet more than its width. If the length of the floor is 12 feet, what is the area

The length of a rectangular kitchen floor is 3 feet more than its width. If the length of the floor is 12 feet, what is the area

admin2013-05-19  28
问题 The length of a rectangular kitchen floor is 3 feet more than its width. If the length of the floor is 12 feet, what is the area of the floor in square feet?
选项 A、9
B、15
C、42
D、108
E、144
答案D
解析 The correct answer is D. 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.
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