A rectangular field is surrounded by a fence with a length of 110 meters. If the length is 34.5 meters, how many meters should the width be?
用长110米长的篱笆围成一个长方形的场地，如果长是34.5米，宽应该是多少米？
<gadget id="calculator">110 / 2</gadget>
<output>55</output>

<gadget id="calculator">55 - 34.5</gadget>
<output>20.5</output>

<result>20.5</result>