A rectangular piece of land has a perimeter of 400 meters, and the ratio of length to width is 3:2. What is the area of this piece of land in square meters?
一块长方形地周长400米，长和宽的比是3：2，这块地的面积是多少平方米？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">400 / 2 / 5</gadget>
<output>40</output>

<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">120 * 80</gadget>
<output>9_600</output>

<result>9_600</result>