There are 3 groups with 2 people in each group. A total of 102 trees were planted on Arbor Day, how many trees are planted per person on average?
有3个小组，每组2人．植树节共植树102棵，平均每人植树多少棵？
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">102 / 6</gadget>
<output>17</output>

<result>17</result>