There are three types of books in our school library, among which literature books and reference books account for (2/5) of the total number of books, and popular science books and reference books account for (4/5) of the total number of books. Do you know how many popular science books account for the total number of books? How many times?
我校学校图书馆有三类书籍，其中文学书和工具书占图书总数的(2/5)，科普书和工具书占图书总数的(4/5)，你知道科普书占图书总数的几分之几吗？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>