There are 4 bookshelves in the school book corner, and each shelf has 3 floors. There are 468 books in total. How many books are placed on each shelf on average?
学校图书角有4个书架，每个书架有3层，一共有468本书，平均每个书架每层放多少本书？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">468 / 12</gadget>
<output>39</output>

<result>39</result>