A water canal in Li Village has been built for 12 kilometers, and there is still (1/4) unrepaired. How many kilometers is this water canal?
李村修一条水渠，已经修了12千米，还剩(1/4)没有修，这条水渠有多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 / (3/4)</gadget>
<output>16</output>

<result>16</result>