There are 2 groups of students participating in tree planting, each group has 4 people. There are 104 saplings in total, how many trees are planted per person on average?
有2个小组的同学参加植树，每个小组有4个人．一共有104棵树苗，平均每人植树多少棵？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">104 / 8</gadget>
<output>13</output>

<result>13</result>