To build a road, the full length (1/6) has already been built. If another 800 meters are built, the ratio of the repaired to the unrepaired is 1:2. How many meters is the total length of this road?
修一条公路，已经修了全长的(1/6)，如果再修800米，这时修了的和未修的比是1：2，这条公路全长多少米？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

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

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/3) - (1/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">800 / (1/6)</gadget>
<output>4_800</output>

<result>4_800</result>