There is a rectangular land with a perimeter of 240 meters, the length of which is 20 meters greater than the width, what is the area of this rectangular land?
有一块周长是240米的长方形地，其中长比宽多20米，这块长方形地的面积是多少？
<gadget id="calculator">240 / 2</gadget>
<output>120</output>

<gadget id="calculator">120 + 20</gadget>
<output>140</output>

<gadget id="calculator">140 / 2</gadget>
<output>70</output>

<gadget id="calculator">120 - 70</gadget>
<output>50</output>

<gadget id="calculator">70 * 50</gadget>
<output>3_500</output>

<result>3_500</result>