At the sports meeting, 315 students participated in the gymnastics performance. They are divided into 5 teams on average, and each team is divided into 7 groups on average. How many students are there in each group?
运动会上315个同学参加体操表演．他们平均分成5队，每队平均分成7组．每组有多少个同学？
<gadget id="calculator">315 / 5 / 7</gadget>
<output>9</output>

<result>9</result>