A road has been built for 60 kilometers, which is exactly 40% of the total length. How many kilometers is left on this road?
一条公路修了60千米，正好是全长的40%，求这条公路剩下多少千米？
<gadget id="calculator">40 / 100</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">60 * (3/5)</gadget>
<output>36</output>

<result>36</result>