Use 240 cm long iron wire to form a rectangle. If the width is 45 cm, how many cm should be the length?
用240厘米长的铁丝，围成一个长方形，要使宽是45厘米，长应是多少厘米？
<gadget id="calculator">240 / 2</gadget>
<output>120</output>

<gadget id="calculator">120 - 45</gadget>
<output>75</output>

<result>75</result>