A road construction team has built a road leading to a mountain area, and it has been repaired (3/4), and there are 6 kilometers left. How many kilometers has this road been repaired?
某筑路队修一条通往山区的公路，已经修了(3/4)，还剩6千米，这条公路已经修了多少千米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">6 / (1/4)</gadget>
<output>24</output>

<gadget id="calculator">24 * (3/4)</gadget>
<output>18</output>

<result>18</result>