There are 2,000 books in the library, which are divided into 10 bookshelves. Each shelf has 5 floors. How many books are placed on each floor?
图书馆共有2000本图书，分成10个书架摆放，每个书架有5层，平均每层放多少本书？
<gadget id="calculator">2_000 / 10 / 5</gadget>
<output>40</output>

<result>40</result>