The perimeter of a rectangle is 60 cm and the ratio of length to width is 3:2. What is the area of this rectangle?
一个长方形的周长是60厘米，长与宽的比是3：2．这个长方形的面积是多少？
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">30 - 18</gadget>
<output>12</output>

<gadget id="calculator">18 * 12</gadget>
<output>216</output>

<result>216</result>