To pave a section of road, it is planned to pave 400 meters per day, which can be completed in 25 days. If 500 meters are paved every day, how many days can it be completed? (Solve with ratio)
铺设一段公路，计划每天铺400米，25天可以完成．如果每天铺500米，多少天可以完成？(用比例解)
<gadget id="calculator">400 * 25</gadget>
<output>10_000</output>

<gadget id="calculator">10_000 / 500</gadget>
<output>20</output>

<result>20</result>