The road repair team repairs a road with a length of 480 meters, 80 meters per day for the first three days, and 80 meters per day for the rest, how many days will it take to complete the repair?
修路队修一条长480米的路，前三天每天修80米，剩下的每天修80米，还需要多少天能修完？
<gadget id="calculator">80 * 3</gadget>
<output>240</output>

<gadget id="calculator">480 - 240</gadget>
<output>240</output>

<gadget id="calculator">240 / 80</gadget>
<output>3</output>

<result>3</result>