A rectangular vegetable field with a circumference of 60 meters has a ratio of length to width of 3:2, what is its area in square meters?
周长为60米的一块长方形菜地，长与宽的比为3：2，它的面积是多少平方米．
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

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

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">30 * (3/5)</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>