A 28 cm wire surrounds a 9 cm long rectangle, what is its width?
用一根28厘米的铁丝围成一个长9厘米的长方形，它的宽是几厘米？
<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<gadget id="calculator">14 - 9</gadget>
<output>5</output>

<result>5</result>