Use 76 cm long wire to make a rectangular teaching aid. The width of the teaching aid is 18 cm. What is the length in cm?
用76厘米长的铁丝做一个长方形的教具，教具的宽是18厘米，长是多少厘米？
<gadget id="calculator">76 / 2</gadget>
<output>38</output>

<gadget id="calculator">38 - 18</gadget>
<output>20</output>

<result>20</result>