Two classes of the fifth grade of Guanghua Primary School participated in the tree planting activity, with an average of 50 students in each class, and a total of 300 trees were planted. How many trees were planted by each person on average?
光华小学五年级2个班参加植树活动，平均每个班50人，共植树300棵，平均每人植树多少棵？
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">300 / 100</gadget>
<output>3</output>

<result>3</result>