piece of iron wire can just enclose a square with a side length of 12. If it is encircled into a rectangle with a side length of 16, what is the width of this rectangle?
一根铁丝，恰好可以围成边长为12的正方形，如果将它围成长为16的长方形，则这个长方形的宽是多少？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">24 - 16</gadget>
<output>8</output>

<result>8</result>