The original rectangular green area of Songbai Park is 600 square meters. If we want to increase the length of the green area from the original 30 meters to 35 meters, the width remains unchanged. How many square meters is the expanded green area?
松柏公园原来一块长方形的绿地面积是600平方米，如果现在要把绿地的长从原来的30米增加到35米，宽保持不变．问扩大后的绿地面积是多少平方米？
<gadget id="calculator">600 / 30</gadget>
<output>20</output>

<gadget id="calculator">20 * 35</gadget>
<output>700</output>

<result>700</result>