school donates 288 books to 4 classes, and each class has 4 groups. How many books are donated by each group on average?
某学校4个班捐书288本，每个班4个小组，问平均每个小组捐书多少本？
<gadget id="calculator">288 / 4 / 4</gadget>
<output>18</output>

<result>18</result>