There are 270 comic books in the school library. There are 3 bookshelves, each with 6 floors. How many books are placed on each floor?
学校图书馆共有270本连环画，有3个书架，每个6层，平均每层放几本？
<gadget id="calculator">270 / 3 / 6</gadget>
<output>15</output>

<result>15</result>