There are 2,500 science and technology books in the library, equivalent to (5/9) of literature and art books, and the number of literature and art books is equivalent to (5/12) of all books. How many books are there in this library?
图书馆内有科技书2500册，相当于文艺书的(5/9)，文艺书的数量又相当于全部书的(5/12)，这个图书馆共有图书多少册？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">2_500 / (5/9) / (5/12)</gadget>
<output>10_800</output>

<result>10_800</result>