An engineering team wants to repair a road with a length of 870 meters. It has been repaired for 15 days and there are still 90 meters left to be repaired. How many meters are repaired per day on average?
一个工程队要修一条长870米的公路，已经修了15天还剩下90米没修，平均每天修多少米？
<gadget id="calculator">870 - 90</gadget>
<output>780</output>

<gadget id="calculator">780 / 15</gadget>
<output>52</output>

<result>52</result>