15% of the road was repaired on the first day, and 20% was repaired on the second day. There are still 260 meters left to be repaired. How many meters is this road?
修一段公路，第一天修了15%，第二天修了20%，还剩下260米没有修，这段公路多少米？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/20) + (1/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (7/20)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">260 / (13/20)</gadget>
<output>400</output>

<result>400</result>