If the width of a rectangle remains the same and the length increases by 4 meters, the area increases by 8 square meters; if the length remains the same and the width increases by 4 meters, the area increases by 24 square meters. What is the area of this rectangle in square meters?
一个长方形如果宽不变，长增加4米，面积就增加8平方米；如果长不变，宽增加4米，面积就增加24平方米．这个长方形的面积是多少平方米？
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>