A piece of rectangular paper can be cut into two squares with a side length of 4 cm. What is the perimeter of the original rectangle?
一张长方形的纸正好可以裁成两张边长4厘米的正方形，原来长方形的周长是多少．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 4</gadget>
<output>12</output>

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

<result>24</result>