A square with a side length of 9 cm can be formed by a piece of wire. If it is changed into a rectangle with a length of 10 cm, what is the width of the rectangle?
用一根铁丝可围成一个边长为9厘米的正方形．如果将它改围成一个长为10厘米的长方形，长方形的宽应该是多少厘米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<result>8</result>