The school bought 560 books and put them on 4 bookshelves. Each shelf has 2 floors. How many books are placed on each floor?
学校买来560本书，分放在4个图书架上，每个书架有2层，平均每层放多少本？
<gadget id="calculator">560 / 4 / 2</gadget>
<output>70</output>

<result>70</result>