A rectangle is 24 meters long and twice as wide, what is the perimeter of the rectangle?
一个长方形，长是24米，是宽的两倍，这个长方形的周长是多少？
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">24 + 12</gadget>
<output>36</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<result>72</result>