The engineering team repaired a 2,400-kilometer road in three days. On the first day, 20% of the total length was repaired, and on the second day, 42% of the total length was repaired. How many kilometers were repaired on the third day?
工程队三天修完一段长2400千米的路，第一天修了全长的20%，第二天修了全长的42%，第三天修了多少千米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">42 / 100</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">1 - (1/5) - (21/50)</gadget>
<output>19/50 = around 0.38</output>

<gadget id="calculator">2_400 * (19/50)</gadget>
<output>912</output>

<result>912</result>