The perimeter of a rectangle is 7.8 cm, and the ratio of length to width is 2:1. What is the area of the rectangle?
一个长方形的周长是7.8cm，长和宽的比是2：1，这个长方形面积是多少？
<gadget id="calculator">7.8 / 2</gadget>
<output>3.9</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">3.9 * (2/3)</gadget>
<output>2.6</output>

<gadget id="calculator">3.9 - 2.6</gadget>
<output>1.3</output>

<gadget id="calculator">2.6 * 1.3</gadget>
<output>3.38</output>

<result>3.38</result>