road builder wants to build a road. On the first day, he built 120 meters, and on the second day, he built 1/3 of the full length. In two days, he built a total of 300 meters. How many meters is this road in total?
修路工人要修一条路，第一天修了120米，第二天修了全长的(1/3)，两天共修了300米，这条路共多少米？
<gadget id="calculator">300 - 120</gadget>
<output>180</output>

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

<gadget id="calculator">180 / (1/3)</gadget>
<output>540</output>

<result>540</result>