A rectangle with a perimeter of 20 cm has a ratio of length to width of 3:2, what is its area in square centimeters?
一个周长为20厘米的长方形，长与宽的比是3：2，它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>