There is a sidewalk with a width of 6 meters and an area of 720 square meters. For the convenience of walking, the width of the road should be increased to 18 meters, and the length remains unchanged. What is the area of this sidewalk after widening?
有一条宽6米的人行道，占地面积是720平方米．为了行走方便，道路的宽度要增加到18米，长不变．问扩宽后这条人行道的面积是多少？
<gadget id="calculator">720 / 6</gadget>
<output>120</output>

<gadget id="calculator">120 * 18</gadget>
<output>2_160</output>

<result>2_160</result>