To dig a 24 km long canal, 25% 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25%，余下的第二周挖完，第二周挖了多少千米？
<gadget id="calculator">25 / 100</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">24 * (3/4)</gadget>
<output>18</output>

<result>18</result>