The school library bought back 20,000 new books, and put these new books on 25 new bookshelves on average. Each bookshelf has 4 floors. How many books are placed on each floor on average?
学校图书室买回了20000本新图书，把这些新图书平均摆放在25个新书架上，每个书架有4层，平均每层摆放多少本？
<gadget id="calculator">20_000 / 25 / 4</gadget>
<output>200</output>

<result>200</result>