A wire encloses a square with side length 6 cm. If it is changed into a rectangle with a length of 9 cm, what is the width of this rectangle in cm?
一根铁丝正好围成一个边长为6cm的正方形．如果把它改围成一个长是9cm的长方形，那么这个长方形的宽是多少厘米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<result>3</result>