To build a road, 15% of its total length was built on the first day, and 120 meters on the second day. At this time, the remaining full length (13/20) is how many meters is this road?
修一条公路，第一天修了全长的15%，第二天修了120米，这时还余下全长的(13/20)，这条公路长多少米？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">13 / 20</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">(3/20) + (13/20)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">120 / (1/5)</gadget>
<output>600</output>

<result>600</result>