There is a rectangular flower bed with a circumference of 72 meters, and the length is three times the width. What is the area of the rectangular flower bed?
有一个周长72米的长方形花坛，长是宽的3倍，请问这个长方形花坛占地面积是多少？
<gadget id="calculator">72 / 2</gadget>
<output>36</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">36 * (3/4)</gadget>
<output>27</output>

<gadget id="calculator">36 - 27</gadget>
<output>9</output>

<gadget id="calculator">27 * 9</gadget>
<output>243</output>

<result>243</result>