There are 3 bookshelves in Xiaoming's house, each with 4 floors, and there are 276 books in total. How many books are placed on each shelf on average?
小明家有3个书架，每个书架有4层，一共放276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">276 / 12</gadget>
<output>23</output>

<result>23</result>