A road repair team builds a road. The original plan was to repair 200 meters per day and complete the task in 15 days. In fact, 250 meters are repaired every day, so that the task can be completed a few days earlier than the original plan?
一个修路队修一条公路．原计划每天修200米，15天完成任务．实际每天修250米，这样可以比原计划提前几天完成任务？
<gadget id="calculator">15 / 250</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">200 * (3/50)</gadget>
<output>12</output>

<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<result>3</result>