A rectangle is 2 meters wide and 3 times as long as it is wide, what is its perimeter in meters?
一个长方形宽2米，长是宽的3倍，它的周长是多少米．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>