To build a 4,800-meter-long road, 2,700 meters have been built, and the rest will take 21 days to complete. How many meters are repaired per day on average?
修一条4800米长的公路，已经修了2700米，剩下的要21天修完，平均每天修多少米？
<gadget id="calculator">4_800 - 2_700</gadget>
<output>2_100</output>

<gadget id="calculator">2_100 / 21</gadget>
<output>100</output>

<result>100</result>