Students from four classes in the third grade participated in the tree planting activity. Each class was divided into 2 groups, and a total of 240 trees were planted. How many trees were planted in each group on average?
三年级四个班的同学参加植树活动，每班分成2组，一共植了240棵树，平均每组植树多少棵？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">240 / 8</gadget>
<output>30</output>

<result>30</result>