If the length of a rectangle remains the same, the width increases by 2 meters, and the area increases by 12 square meters; if the width remains the same, the length increases by 3 meters, and the area also increases by 12 square meters. What is the area of this rectangle in square meters.
一个长方形的长不变，宽增加2米，面积要增加12平方米；如果宽不变，长增加3米，面积也增加12平方米．这个长方形的面积是多少平方米．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>