In the reading activity, Xiao Li read 7 books, Xiao Ming read 5 books, Xiao Hua read 4 books, Xiao Jun read 8 books, how many extra-curricular books each person read on average.
在读书活动中，小丽读了7本，小明读了5本，小华读了4本，小军读了8本，平均每人读多少本课外书．
<gadget id="calculator">7 + 5 + 4 + 8</gadget>
<output>24</output>

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<result>6</result>