The perimeter of a rectangle is 108 cm and the ratio of length to width is 5:4. What is the area of this rectangle?
一个长方形的周长是108厘米，长与宽的比是5：4．这个长方形的面积是多少？
<gadget id="calculator">108 / 2</gadget>
<output>54</output>

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

<gadget id="calculator">54 / 9</gadget>
<output>6</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">54 - 30</gadget>
<output>24</output>

<gadget id="calculator">30 * 24</gadget>
<output>720</output>

<result>720</result>