The perimeter of a rectangular vegetable field is 120 meters, and the ratio of length to perimeter is 3:10. What is the area of this vegetable field in square meters?
一块长方形菜地的周长120米，长与周长的比是3：10，这块菜地面积是多少平方米？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">120 * (3/10)</gadget>
<output>36</output>

<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">60 - 36</gadget>
<output>24</output>

<gadget id="calculator">36 * 24</gadget>
<output>864</output>

<result>864</result>