A wire 24 meters long can form a rectangle with a length of 8 meters and a width of many meters.
一根长24米的铁丝可以围成一个长8米，宽多少米的长方形．
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

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

<result>4</result>