What is the perimeter of a rectangle that is 5 meters long and 2 meters wide?
一个长方形长5米、宽2米，周长是多少米．
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<result>14</result>