18 cm long iron wire is used to form a rectangle, its length is 5 cm, and its width is how many cm?
用18厘米长的铁丝围成一个长方形，它的长是5厘米，宽是多少厘米？
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<result>4</result>