To build a road of 1450 meters, 640 meters have been built, and the rest will be completed in 15 days. How many meters are repaired per day on average?
修一条1450米的路，已经修了640米，剩下的要15天修完，平均每天修多少米？
<gadget id="calculator">1_450 - 640</gadget>
<output>810</output>

<gadget id="calculator">810 / 15</gadget>
<output>54</output>

<result>54</result>