The area of a rectangle is 168cm**2, its length and width are two adjacent even numbers, what is its perimeter.
一个长方形的面积是168cm**2，它的长和宽是相邻的两个偶数，它的周长是多少．
<gadget id="calculator">12 + 14</gadget>
<output>26</output>

<gadget id="calculator">26 * 2</gadget>
<output>52</output>

<result>52</result>