The perimeter of a rectangle is 84cm, and the ratio of its length to width is 2:1. What are the areas of the rectangle?
一个长方形的周长是84cm，它的长与宽的比是2：1，这个长方形的面积分别是多少？
<gadget id="calculator">84 / 2</gadget>
<output>42</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">42 * (2/3)</gadget>
<output>28</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">42 * (1/3)</gadget>
<output>14</output>

<gadget id="calculator">28 * 14</gadget>
<output>392</output>

<result>392</result>