Given that the area of the lawn is 120m**2, if the length of the rectangular lawn is tripled and the width remains the same, what is the area of the lawn after expansion?
已知草坪的面积是120m**2，若将这个长方形草坪的长扩大到原来的3倍，宽不变，则扩建后草坪的面积是多少平方米？
<gadget id="calculator">120 * 3</gadget>
<output>360</output>

<result>360</result>