rectangle with a length to width ratio of 4:3 is surrounded by an 84 cm iron wire. What is the area of the rectangle in square centimeters?
用一根84厘米的铁丝围成一个长与宽的比是4﹕3的长方形，长方形的面积是多少平方厘米？
<gadget id="calculator">84 / 2</gadget>
<output>42</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">42 * (4/7)</gadget>
<output>24</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">42 * (3/7)</gadget>
<output>18</output>

<gadget id="calculator">24 * 18</gadget>
<output>432</output>

<result>432</result>