rectangle is 9 meters long and 5 meters wide, what is its perimeter?
一个长方形的长是9米，宽是5米，它的周长是多少？
<gadget id="calculator">9 + 5</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<result>28</result>