There is a sidewalk with a width of 4 meters, covering an area of 480 square meters. In order to facilitate people to walk, the width of the road should be increased to 12 meters, and the length remains unchanged. What is the area of the sidewalk after widening? (please use two methods to answer)
有一条宽为4米的人行道，占地面积为480平方米，为了方便人们行走，道路的宽度要增加到12米，长不变，问拓宽后这条人行道的面积是多少平方米．(请用两种方法解答)
<gadget id="calculator">480 / 4</gadget>
<output>120</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">120 * 8</gadget>
<output>960</output>

<gadget id="calculator">480 + 960</gadget>
<output>1_440</output>

<result>1_440</result>