A rectangular iron sheet is 3 meters long and 2 meters wide, what is its perimeter in meters?
一块长方形铁皮的长是3米，宽是2米，它的周长是多少米．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>