The perimeter of the school's rectangular flowerbed is 36 meters, and the ratio of length to width is 5:4. If all roses are planted, how many square meters is the area for planting roses?
学校的长方形花圃周长36米，长与宽的比5：4．如果全部栽种月季花，种植月季花的面积是多少平方米．
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

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