The perimeter of a rectangle is 84 decimeters, and the ratio of length to width is 4:3, what is its area?
一个长方形的周长为84分米，长与宽的比是4：3，它的面积是多少平方分米？
<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">42 - 24</gadget>
<output>18</output>

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

<result>432</result>