There is a rectangle whose perimeter is 54 decimeters, and the ratio of length to width is 5:4, what is its area?
有一个长方形的周长是54分米，长和宽的比是5：4，它的面积是多少？
<gadget id="calculator">54 / 2</gadget>
<output>27</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">27 * (5/9)</gadget>
<output>15</output>

<gadget id="calculator">27 - 15</gadget>
<output>12</output>

<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<result>180</result>