The area of a rectangular park is 20 hectares. If the length of the park is tripled and the width is doubled, what is the area of the park after expansion?
一个长方形公园的面积是20公顷，将公园的长扩大到原来的3倍，宽扩大到原来的2倍，扩建后的公园面积是多少公顷．
<gadget id="calculator">20 * 3 * 2</gadget>
<output>120</output>

<result>120</result>