road construction team built a road. In the first 9 days of September, they built a total of 800 meters. In order to celebrate the National Day, they built a total of 1,300 meters in the next 21 days. How many meters of roads are repaired per day in September?
某修路队修一条公路，九月份前9天共修了800米，为了向国庆节献礼，后21天共修了1300米，九月份平均每天修路多少米？
<gadget id="calculator">800 + 1_300</gadget>
<output>2_100</output>

<gadget id="calculator">13 + 17</gadget>
<output>30</output>

<gadget id="calculator">2_100 / 30</gadget>
<output>70</output>

<result>70</result>