There is a rectangular fish pond with a length of 35 meters and an area of 700 square meters. Now we want to increase the length of this fish pond to 40 meters and keep the width unchanged. What is the area of the enlarged fish pond?
有一个长方形鱼塘，长是35米，面积是700平方米．现在要把这个鱼塘的长增加到40米，宽不变，扩大后的鱼塘面积是多少？
<gadget id="calculator">700 / 35</gadget>
<output>20</output>

<gadget id="calculator">40 * 20</gadget>
<output>800</output>

<result>800</result>