At the sports meeting, 315 students participated in the gymnastics performance. They are divided into 7 teams on average, and each team is divided into 5 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7个队，每队平均分成5组，每组有多少个同学？
<gadget id="calculator">315 / 7 / 5</gadget>
<output>9</output>

<result>9</result>