To build a road, the full length (1/4) was repaired in the first month, and 35% of the total length was repaired in the second month. At this time, there are still 120 kilometers left. How many kilometers is the total length of this road?
修一条公路，第一个月修了全长的(1/4)，第二个月修了全长的35%，这时还剩120千米，这条公路全长多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (1/4) - (7/20)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<result>300</result>