During the summer vacation, Xiaoqiang and his three good friends went to collect leaf specimens. They collected a total of 216 species in 3 days. How many species of leaf specimens did each person collect on average per day?
放暑假小强和他的3个好朋友去采集树叶标本，3天共采集了216种，平均每人每天采集了多少种树叶标本？
<gadget id="calculator">216 / 4 / 3</gadget>
<output>18</output>

<result>18</result>