A square and a rectangle have the same perimeter. The perimeter of the square is 40 decimeters. If the width of the rectangle is 8 decimeters, what is the area of the rectangle?
一个正方形和一个长方形的周长相等，正方形的周长是40分米，如果长方形的宽是8分米，这个长方形的面积是多少？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<gadget id="calculator">12 * 8</gadget>
<output>96</output>

<result>96</result>