Three classes in the sixth grade planted trees. There were 62 students in the first class, and a total of 155 trees were planted. There were 64 students in the second class, and an average of 3 trees were planted per person. There were 66 students in the third class, and a total of 133 trees were planted. How many trees does each person plant on average in the three classes of grade six?
六年级三个班同学植树，一班有62人，共植树155棵，二班有64人，平均每人植树3棵，三班有66人，共植树133棵．六年级三个班平均每人植树多少棵？
<gadget id="calculator">64 * 3</gadget>
<output>192</output>

<gadget id="calculator">155 + 192 + 133</gadget>
<output>480</output>

<gadget id="calculator">62 + 64 + 66</gadget>
<output>192</output>

<gadget id="calculator">480 / 192</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>