The area of a rectangular green space is 450 square meters, and the width is 9 meters. Next spring, the management staff of the landscaping department plans to expand the area of the green space. The length of the green space remains the same, but the width increases to 18 meters. What is the expanded area? (answer in two ways)
一块长方形绿地的面积是450平方米，宽是9米，明年春天园林绿化处管理人员打算要扩大绿地的面积，绿地的长不变，宽增加到18米，扩大后的面积是多少？(用两种方法解答)
<gadget id="calculator">450 / 9</gadget>
<output>50</output>

<gadget id="calculator">50 * 18</gadget>
<output>900</output>

<result>900</result>