A rectangle is 20 meters long and 8 meters longer than its width, what is its area?
一个长方形长是20米，比宽长8米，它的面积是多少？
<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<result>240</result>