The school bought 1,800 books and put them on 6 bookshelves. Each shelf has 3 floors. How many books are placed on each shelf on average?
学校买回图书1800本，分别放在6个书架上，每个书架有3层，平均每层书架放图书多少本？
<gadget id="calculator">1_800 / 6 / 3</gadget>
<output>100</output>

<result>100</result>