Hong Hong uses a 34 cm long iron wire to form a 9 cm long rectangle, please calculate the width of this rectangle.
红红用一根长34厘米的铁丝围成一个长为9厘米的长方形，请你算出这个长方形的宽．
<gadget id="calculator">34 / 2</gadget>
<output>17</output>

<gadget id="calculator">17 - 9</gadget>
<output>8</output>

<result>8</result>