A road construction team repairs a 630-meter-long road. It has been repaired for 4 days, and there are 230 meters left. How many meters are repaired per day on average? (column equation solution)
一个筑路队修一条630米长的公路，已经修了4天，还剩下230米，平均每天修多少米？(列方程解答)
<gadget id="calculator">630 - 230</gadget>
<output>400</output>

<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<result>100</result>