The perimeter of a rectangle is 20 cm, and the ratio of length to width is 3:2. What is the area of the rectangle?
一个长方形的周长是20厘米，长与宽的比是3：2，这个长方形的面积是多少平方厘米？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">20 / 2 / 5</gadget>
<output>2</output>

<gadget id="calculator">3 * 2 * 2 * 2</gadget>
<output>24</output>

<result>24</result>