rectangular lawn with an area of 120 square meters is enlarged to 3 times its original length and its width remains unchanged. What is the area of the lawn after expansion?
一个面积为120平方米的长方形草坪，将它的长扩大到原来的3倍，宽不变，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>