After an iron wire with a length of 864 cm is wound four times around a rectangle, there is still 24 cm left. What is the perimeter of the rectangle in cm?
一根长864厘米的铁丝绕一个长方形绕了四圈后，还剩下24厘米，这个长方形的周长是多少厘米？
<gadget id="calculator">864 - 24</gadget>
<output>840</output>

<gadget id="calculator">840 / 4</gadget>
<output>210</output>

<result>210</result>