Teacher Wu made a rectangular teaching aid with 60 cm long iron wire. It is 25 cm long and what is the width.
吴老师用60厘米长的铁丝做了一个长方形的教具，长25厘米，宽是多少．
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<result>5</result>