Divide a square with a perimeter of 24 decimeters into two identical rectangles, what is the perimeter of each rectangle?
把一个周长是24分米的正方形分割成两个完全一样的长方形，每个长方形的周长是多少分米？
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>