Q18:Note: Figure not drawn to scale.
The figure shows a square patio surrounded by a walkway of width x meters. If the area of the walkway is 132 square meters and the width of the patio is 5 meters greater than
the width of the walkway, what is the area of the patio, in square meters?
A. 56
B. 64
C. 68
D. 81
E. 100
有图形，但是不能贴？
Patio是小正方形，外面四边是宽为X的跑道。
根据题目列出方程（3X+5)^2-(x+5)^2=132,大正方形-正方形天井的面积就是跑道的面积。
得出X=3,天井面积=（3+5）^2=64
为什么答案是100呢？ | 
