Use 72 decimeters of iron wire to form a rectangle. The ratio of the length to the width of the rectangle is 5:4. What is the area of the rectangle?
用72分米长的铁丝围成一个长方形，长方形的长和宽的比是5：4，这个长方形的面积是多少平方分米？
<gadget id="calculator">72 / 2</gadget>
<output>36</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">36 * (5/9)</gadget>
<output>20</output>

<gadget id="calculator">36 - 20</gadget>
<output>16</output>

<gadget id="calculator">20 * 16</gadget>
<output>320</output>

<result>320</result>