There are 784 books in the school library, which are placed on 7 shelves on average, and each shelf has 4 floors. How many books are placed on each floor on average?
校图书馆有784本书，平均放在7个书架上，每个书架有4层，平均每层放了多少本书？
<gadget id="calculator">784 / 7 / 4</gadget>
<output>28</output>

<result>28</result>