The road repair team planned to build a road. The original plan was to repair 250 meters per day, but the actual repair was 50 meters more per day. In this way, the task was completed 2 days ahead of schedule. How many days did it take to complete the task as originally planned?
修路队计划修一条公路，原计划每天修250米，实际每天多修50米，这样提前2天完成了任务，原计划完成任务需要多少天？
<gadget id="calculator">250 * 2</gadget>
<output>500</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">500 + 100</gadget>
<output>600</output>

<gadget id="calculator">50 - 250</gadget>
<output>-200</output>

<gadget id="calculator">250 + (-200)</gadget>
<output>50</output>

<gadget id="calculator">600 / 50</gadget>
<output>12</output>

<result>12</result>