The original plan to build a section of road is 80 meters per day, which can be completed in 15 days, but actually 100 meters per day. How many days to complete the task?
修一段公路原计划每天修80米，15天可以修完，实际每天修100米．实际几天就完成任务？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">80 * (3/20)</gadget>
<output>12</output>

<result>12</result>