60% of a 15-kilometer road has been built, how many kilometers are left to be repaired?
修一条长15千米的公路，已经修了60%，还有多少千米没有修？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">15 * (2/5)</gadget>
<output>6</output>

<result>6</result>