To build a road, the original plan was to build 48 meters per day, and it took 15 days to complete the construction. The actual construction was 12 meters more than planned every day. How many days did it take to complete the construction?
修一条路，原计划每天修48米，15天修完，实际每天比计划多修12米，实际几天修完？
<gadget id="calculator">48 + 12</gadget>
<output>60</output>

<gadget id="calculator">15 / 60</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">48 * (1/4)</gadget>
<output>12</output>

<result>12</result>