To build a road, 25% of the whole road was repaired for the first time, and 15% of the whole process was repaired for the second time, and there are still 120 kilometers to be repaired. How many kilometers is the total length of this road?
修一条公路，第一次修了25%，第二次修了全程的15%，还有120千米没修，这条公路全长多少千米？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (1/4) - (3/20)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">120 / (3/5)</gadget>
<output>200</output>

<result>200</result>