Use 84 cm long iron wire to form a rectangle, the ratio of the length to width of this rectangle is 4:3. What is the area of this rectangle?
用84厘米长的铁丝围成一个长方形，这个长方形长和宽的比是4：3．这个长方形的面积是多少？
<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">42 - 24</gadget>
<output>18</output>

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

<result>432</result>