A rectangle is 6 cm wide and 3 times as long as it is wide. what is the perimeter of this rectangle
一个长方形，宽是6厘米，长是宽的3倍．这个长方形的周长是多少
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">6 + 18</gadget>
<output>24</output>

<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<result>48</result>