To build a road, the original plan was to build 18 kilometers per day, and the repair was completed in 15 days. The actual repair was 27 kilometers per day. How many days earlier than the original plan was the actual repair?
修一条路，原计划每天修18千米，15天修完，实际每天修27千米，实际比原计划提前几天修完？
<gadget id="calculator">15 / 27</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">18 * (5/9)</gadget>
<output>10</output>

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<result>5</result>