There is a rectangular grassland with an area of 180 square meters in the park, and the width of the grassland is 9 meters. If the length is increased to 60 meters and the width remains the same, how many square meters is the expanded grass area?
公园里有一块面积180平方米的长方形草地，草地的宽是9米．如果把长增加到60米，宽不变，扩大后的草地面积是多少平方米？
<gadget id="calculator">180 / 9</gadget>
<output>20</output>

<gadget id="calculator">60 / 20</gadget>
<output>3</output>

<gadget id="calculator">180 * 3</gadget>
<output>540</output>

<result>540</result>