Use 84cm iron wire to form a rectangle so that the ratio of its length to width is 4:3. What is the area of this rectangle in square centimeters?
用84cm的铁丝围成一个长方形使它的长和宽的比是4：3，这个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">3 + 4</gadget>
<output>7</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">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

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

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

<result>432</result>