To build a road, the whole length (1/4) was built for the first time, and 15% of the whole length was repaired for the second time. At this time, there is still 6 kilometers away from the middle point of the road. How many kilometers is the total length of this road?
修一条公路，第一次修了全程的(1/4)，第二次又修了全程的15%，这时距公路中点还有6千米，这条公路全长多少千米？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) + (3/20)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">6 / (1/10)</gadget>
<output>60</output>

<result>60</result>