A road has been built (2/5), and there are 6 kilometers left to be repaired. How many kilometers is this road?
一条公路已修了(2/5)，还剩下6千米没有修，这条公路长多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">6 / (3/5)</gadget>
<output>10</output>

<result>10</result>