The school organized students to plant trees. A total of 540 people went, and they were divided into 5 tree planting sites on average, and each tree planting site was divided into 9 groups on average. How many people are in each group?
学校组织学生去植树，共去了540人，要平均分成5个植树点，每个植树点平均分成9组．每组有多少人？
<gadget id="calculator">540 / 5 / 9</gadget>
<output>12</output>

<result>12</result>