A rectangular vegetable field has a perimeter of 36 meters and a ratio of length to width of 1:2. What is the area of the vegetable field in square meters?
一个长方形菜地，周长是36米，长和宽的比是1：2，这个菜地的面积是多少平方米？
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18 * (1/3)</gadget>
<output>6</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">18 * (2/3)</gadget>
<output>12</output>

<gadget id="calculator">6 * 12</gadget>
<output>72</output>

<result>72</result>