The school library newly purchased 126 books, which are placed on 3 identical bookshelves, and each shelf has 6 floors. How many books are placed on each shelf on average?
学校图书室新购进图书126本，摆放在3个相同的书架上，每个书架有6层，平均每个书架每层摆放多少本图书？
<gadget id="calculator">126 / 3 / 6</gadget>
<output>7</output>

<result>7</result>