The road repair team repairs a road, 10% of the entire length is repaired on the first day, 210 meters are repaired on the second day, and (2/3) is left unrepaired. How many meters is the total length of this road?
修路队修一条公路，第一天修全程的10%，第二天修210米，还剩(2/3)没修，这条公路全长多少米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (2/3) - (1/10)</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">210 / (7/30)</gadget>
<output>900</output>

<result>900</result>