A highway is built in three days. (1/6) of the highway was built on the first day, 15 kilometers on the second day, and 20 kilometers on the third day. How many kilometers is this road?
修一条公路三天修完，第一天修了这条公路的(1/6)，第二天修了15千米，第三天修了20千米．这条公路长多少千米？
<gadget id="calculator">15 + 20</gadget>
<output>35</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">35 / (5/6)</gadget>
<output>42</output>

<result>42</result>