A square with side length 9 cm is divided into three equal rectangles, what is the sum of the perimeters of the three rectangles in cm?
一个边长是9厘米的正方形分成三个相等的长方形，这三个长方形的周长总和是多少厘米．
<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<gadget id="calculator">9 + 3</gadget>
<output>12</output>

<gadget id="calculator">12 * 2 * 3</gadget>
<output>72</output>

<result>72</result>