A road has been repaired for 400 meters, and the rest is 120 meters less than the total length (2/3), how many meters is the total length?
一条路修完400米，剩下的比全长的(2/3)少120米，全长多少米？
<gadget id="calculator">400 - 120</gadget>
<output>280</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">280 / (1/3)</gadget>
<output>840</output>

<result>840</result>