The perimeter of a rectangle is twice that of the square. The side length of the square and the width of the rectangle are both 4 cm. What is the length of the rectangle in cm?
一个长方形的周长是正方形的2倍，正方形的边长与长方形的宽都为4cm，长方形的长是多少cm？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<gadget id="calculator">32 / 2</gadget>
<output>16</output>

<gadget id="calculator">16 - 4</gadget>
<output>12</output>

<result>12</result>