To build a section of road, the full length (1/3) was repaired on the first day, 500 meters was repaired on the second day, and 40% of the total length was repaired in two days. How many meters is the total length of this road?
修一段路，第一天修了全长的(1/3)，第二天修了500米，两天正好修了全长的40%，这条路全长多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">500 / (1/15)</gadget>
<output>7_500</output>

<result>7_500</result>