The length of a rectangle is 6 decimeters and its length is 3 times its width, what is its area in square decimeters
一个长方形的长是6分米，长是宽的3倍，它的面积是多少平方分米
<gadget id="calculator">6 / 3</gadget>
<output>2</output>

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

<result>12</result>