The area of a rectangle is 72 square centimeters, and the ratio of length to width is 2:1. What is the perimeter of the rectangle in centimeters?
一个长方形的面积是72平方厘米，长和宽的比是2：1，这个长方形的周长是多少厘米．
<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>