An engineering team planned to build a canal, and the plan was to complete it in 25 days, but it actually took only 20 days to complete the task. How much ahead of schedule actually.
某工程队计划修一条水渠，计划25天完成，实际只用了20天就完成了任务．实际比计划提前了多少．
<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">5 / 25</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>