The school library purchased 480 books and put them on 3 bookshelves on average, with 4 floors on each bookshelf. How many books are placed on each floor on average?
学校图书馆购进480本图书，平均放在3个书架上，每个书架上放4层．平均每层放多少本？
<gadget id="calculator">480 / 8</gadget>
<output>60</output>

<result>60</result>