Dig a 24-kilometer-long canal, 20% of the total length was dug in the first week, and the rest was dug in the second week. How many kilometers were dug in the second week?
挖一条24千米长的水渠，第一周挖了全长的20%，余下的第二周挖完，第二周挖了多少千米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">24 * (4/5)</gadget>
<output>96/5 = around 19.2</output>

<result>96/5 = around 19.2</result>