The engineering team repaired a road, 20 meters a day, and finally repaired 25% of the total length in 6 days. According to this calculation, how many days will it take to complete the remaining project?
工程队修一条公路，每天修20米，结果6天修了全长的25%，照这样计算，余下的工程还要几天修完？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">6 / (1/4)</gadget>
<output>24</output>

<gadget id="calculator">24 - 6</gadget>
<output>18</output>

<result>18</result>