To build a road with a length of 2,800 meters, 15% of the total length will be repaired every day for the first two days. After the remaining 7 days, how many meters will be repaired on average per day?
修一条长2800米的公路，前两天每天修全长的15%．余下的7天修完，平均每天要修多少米？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * 2</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) / 7</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2_800 * (1/10)</gadget>
<output>280</output>

<result>280</result>