The school shipped 224 books and put them on two bookshelves. Each bookshelf has 4 layers. How many books are placed on each shelf on average?
学校运来224本书，放在两个书架上，每个书架有4层，平均每个书架每层放多少本书？
<gadget id="calculator">224 / 2 / 4</gadget>
<output>28</output>

<result>28</result>