The perimeter of a rectangular piece of land is 120 meters, and the width is 12 meters shorter than the length. What is the area of this piece of land in square meters?
一块长方形地的周长是120米，其中宽比长短12米，这块地的面积是多少平方米．
<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">60 + 12</gadget>
<output>72</output>

<gadget id="calculator">72 / 2</gadget>
<output>36</output>

<gadget id="calculator">36 - 12</gadget>
<output>24</output>

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

<result>864</result>