Uncle Wang is going on a trip by bicycle. Walk 75 kilometers on the first day, 25 kilometers in the morning on the second day, 35 kilometers in the afternoon, and 81 kilometers on the third day. How many miles per day on average?
王叔叔骑自行车去旅行．第一天行75千米，第二天上午行25千米、下午行35千米，第三天行81千米．平均每天行多少千米？
<gadget id="calculator">75 + 25 + 35 + 81</gadget>
<output>216</output>

<gadget id="calculator">216 / 3</gadget>
<output>72</output>

<result>72</result>