Use 3 rectangles of the same size to form a square. The perimeter of the square is 36 centimeters. What is the perimeter of the original rectangle in centimeters?
用3个同样大小的长方形正好拼成一个正方形，正方形的周长是36厘米，原来一个长方形的周长是多少厘米？
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">36 / 4 / 3</gadget>
<output>3</output>

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

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>