There are 4 classes in the third grade of the Nongke District Primary School, and each class has 9 study groups. There are 252 students in the third grade. How many people are there on average in each group?
农科区小学三年级有4个班，每班有9个学习小组，三年级共有252人，平均每个小组有多少人？
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">252 / 36</gadget>
<output>7</output>

<result>7</result>