A rectangle with a perimeter of 32 cm has a ratio of length to width of 3:1, what is the area of the rectangle?
一个周长32厘米的长方形，长与宽的比是3：1，这个长方形的面积是多少？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">32 / 2 / 4</gadget>
<output>4</output>

<gadget id="calculator">3 * 4 * 1 * 4</gadget>
<output>48</output>

<result>48</result>