The third grade students planted 124 trees, and the fourth grade students planted 32 more trees than the third grade students. How many trees are planted in each grade on average?
三年级同学种树124棵，四年级同学种树的棵数比三年级多32棵，平均每个年级种树多少棵？
<gadget id="calculator">124 + 32</gadget>
<output>156</output>

<gadget id="calculator">124 + 156</gadget>
<output>280</output>

<gadget id="calculator">280 / 2</gadget>
<output>140</output>

<result>140</result>