A total of 180 students from 4 classes in the third grade went to the spring outing, and each class was divided into 3 groups on average. On average, how many students are there in each group in each class?
三年级4个班共有180名同学去春游，每班平均分成3个小组．平均每班每个小组有多少名同学？
<gadget id="calculator">180 / 4 / 3</gadget>
<output>15</output>

<result>15</result>