The road repair team repaired a section of 620-meter-long road, with an average of 80 meters per day in the first 4 days. In order to complete the task on time, the rest must be completed within 3 days. How many meters should be repaired on average per day?
修路队修一段长620米的公路，前4天平均每天修80米，为了按时完成任务，余下的必须3天内完成，平均每天要修多少米．
<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<gadget id="calculator">620 - 320</gadget>
<output>300</output>

<gadget id="calculator">300 / 3</gadget>
<output>100</output>

<result>100</result>