There are more than 1,000 books in the school library, among which science and technology books account for (2/5), story books (3/10), and comic books (1/4). How many of these books account for the total number of books?
学校图书室藏书有1000多本，其中科技书占(2/5)，故事书占(3/10)，连环画占(1/4)，这些书共占藏书总数的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) + (3/10) + (1/4)</gadget>
<output>19/20 = around 0.95</output>

<result>19/20 = around 0.95</result>