rectangular vegetable field has a ratio of length to width of 9:6 and a circumference of 90 meters. What is the area of this vegetable field in square meters?
一个长方形的菜地，长和宽的比是9：6，周长是90米，这块菜地的面积是多少平方米？
<gadget id="calculator">90 / 2</gadget>
<output>45</output>

<gadget id="calculator">9 + 6</gadget>
<output>15</output>

<gadget id="calculator">9 / 15</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">45 * (3/5)</gadget>
<output>27</output>

<gadget id="calculator">6 / 15</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">45 * (2/5)</gadget>
<output>18</output>

<gadget id="calculator">27 * 18</gadget>
<output>486</output>

<result>486</result>