The length of the rectangular lawn is 30 meters and the area is 450 square meters. After the expansion, the width remains the same and the length increases to 150 meters. What will the area be?
长方形草坪的长是30米，面积是450平方米．扩建后宽没变，长增加到150米，面积会变成多少？
<gadget id="calculator">450 / 30</gadget>
<output>15</output>

<gadget id="calculator">15 * 150</gadget>
<output>2_250</output>

<result>2_250</result>