There is a rectangle. If the length is increased by 3 meters, the area will be increased by 18 square meters. If the width is increased by 2 meters, the area will be increased by 36 square meters. What is the area of the original rectangle?
有一个长方形，如果长增加3米，面积就增加18平方米，如果宽增加2米，面积就增加36平方米，原来长方形的面积是多少平方米．
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">18 / 3</gadget>
<output>6</output>

<gadget id="calculator">18 * 6</gadget>
<output>108</output>

<result>108</result>