A 1,500-meter-long road was built. The original plan was to build 50 meters a day, but the actual repair was 75 meters a day. How many days earlier than the original plan was the actual completion?
修一条路1500米长的路，原计划每天修50米，实际每天修75米，实际比原计划提前几天完成？
<gadget id="calculator">1_500 / 50</gadget>
<output>30</output>

<gadget id="calculator">1_500 / 75</gadget>
<output>20</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<result>10</result>