The engineering team had to maintain a 153.4-kilometer road, and completed 42.53 kilometers on the first day, and completed 1.8 kilometers more than the first day on the second day, and completed all the projects on the third day. How long is the highway maintained on the third day?
工程队要维护一条153.4千米的公路，第一天完成了42.53千米，第二天比第一天多完成了1.8千米，第三天要完成全部工程．第三天维护多长的公路？
<gadget id="calculator">42.53 + 1.8</gadget>
<output>44.33</output>

<gadget id="calculator">153.4 - 42.53 - 44.33</gadget>
<output>66.54</output>

<result>66.54</result>