A wire can just enclose a square with a side length of 6 meters. If it is changed to a rectangle, the known length is 8 meters, and how many meters is the width?
一根铁丝正好可以围成边长为6米的正方形，如果改围长方形，已知长是8米，宽是多少米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

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

<result>4</result>