Starlight Village needs to build a 600-meter-long road. It has been repaired for 5 days, with an average of 80 meters per day. The rest will be completed in 4 days. How many meters will be repaired per day on average?
星光村要修一条600米长的公路，已经修了5天，平均每天修80米，剩下的要4天修完，平均每天要修多少米？
<gadget id="calculator">80 * 5</gadget>
<output>400</output>

<gadget id="calculator">600 - 400</gadget>
<output>200</output>

<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<result>50</result>