The road repair team repairs a road. It is known that the average road repair is 105 meters per day. After 15 days of repairs, there are still 280 meters left. How long is this road in meters?
修路队修一条公路，已知平均每天修路105米，修了15天以后还剩280米，这段公路全长多少米？
<gadget id="calculator">105 * 15</gadget>
<output>1_575</output>

<gadget id="calculator">1_575 + 280</gadget>
<output>1_855</output>

<result>1_855</result>