The students in the three classes of the third grade went to plant trees. The first class planted 67 trees, and the second and third classes planted 64 trees. The average number of trees planted in each class of the three classes.
三年级三个班的同学去种树，一班种了67棵，二班和三班各种了64棵，三个班平均每班种树多少棵．
<gadget id="calculator">67 + 64 + 64</gadget>
<output>195</output>

<gadget id="calculator">195 / 3</gadget>
<output>65</output>

<result>65</result>