A rectangular lawn has an area of 480 square meters and a width of 20 meters. After expansion, the length remains the same, but the width increases to 40 meters. What is the area of the playground after expansion?
一个长方形草地，面积480平方米，宽20米，扩建后长不变，宽增加到40米，扩建后操场面积是多少平方米？
<gadget id="calculator">480 / 20</gadget>
<output>24</output>

<gadget id="calculator">24 * 40</gadget>
<output>960</output>

<result>960</result>