Honghu Primary School carried out a book donation activity. 42 people from Class 1, Class 3 donated 86 books in total; 40 people from Class 2, Class 3 donated 114 books in total. The average number of books donated per class.
红湖小学开展捐书活动，三1班42人，共捐书86本；三2班40人，共捐书114本．平均每班捐书多少本．
<gadget id="calculator">86 + 114</gadget>
<output>200</output>

<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<result>100</result>