A rectangular vegetable field is 14 meters long and 11 meters wide, surrounded by a fence. How long is the fence?
一块长方形菜地，长14米，宽11米，四周围上篱笆，篱笆长多少米？
<gadget id="calculator">14 + 11</gadget>
<output>25</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<result>50</result>