If the width of a rectangle remains the same, the length increases by 8 meters and the area increases by 72 square meters. If the length remains the same, the width decreases by 4 meters and the area decreases by 48 square meters. What is the area of the original rectangle?
一个长方形，如果宽不变，长增加8米，面积增加72平方米，如果长不变，宽减少4米，面积减少48平方米，原长方形的面积是多少．
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<gadget id="calculator">72 / 8</gadget>
<output>9</output>

<gadget id="calculator">12 * 9</gadget>
<output>108</output>

<result>108</result>