rectangle whose length is 12 decimeters and 3 decimeters more than its width, what is its area?
一个长方形，它的长是12分米，比宽多3分米，它的面积是多少平方分米？
<gadget id="calculator">12 - 3</gadget>
<output>9</output>

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

<result>108</result>