The road construction team plans to build a 4,800-meter-long road in 15 days. Actually repair 80 meters more every day, how many days actually completed the task?
修路队计划用15天修一条4800米长的公路．实际每天多修80米，实际多少天就完成了任务？
<gadget id="calculator">4_800 / 15</gadget>
<output>320</output>

<gadget id="calculator">320 + 80</gadget>
<output>400</output>

<gadget id="calculator">4_800 / 400</gadget>
<output>12</output>

<result>12</result>