In the tree planting activity, 3 classes in the fifth grade planted 132 trees, and 4 classes in the fourth grade planted 120 trees. The average number of trees planted in each grade.
在植树活动中，五年级3个班共植树132棵，四年级4个班共植树120棵，平均每个年级植树多少棵．
<gadget id="calculator">132 + 120</gadget>
<output>252</output>

<gadget id="calculator">252 / 2</gadget>
<output>126</output>

<result>126</result>