A rectangular lawn is 6 meters wide and has an area of 150 square meters. Now it is necessary to increase its width to 18 meters and keep the length unchanged. What is the enlarged area in square meters?
一块长方形草坪宽6米，面积是150平方米，现在要将它的宽增加到18米，长不变，扩大后的面积是多少平方米？
<gadget id="calculator">18 / 6</gadget>
<output>3</output>

<gadget id="calculator">150 * 3</gadget>
<output>450</output>

<result>450</result>