A rectangular flowerbed has a perimeter of 36 meters and a ratio of length to width of 5:4. What is the area of the garden in meters.
一个长方形花圃，周长是36米，长和宽的比是5：4．这个花圃的面积是多少米．
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">18 * (5/9)</gadget>
<output>10</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">18 * (4/9)</gadget>
<output>8</output>

<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<result>80</result>