A 22 cm long wire is used to form a 7 cm long rectangle, what is its width in cm?
用一根22厘米长的铁丝围成一个长7厘米的长方形，它的宽是多少厘米．
<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<gadget id="calculator">11 - 7</gadget>
<output>4</output>

<result>4</result>