The science and technology books in the school reading room account for 35% of the total number of books, and the literature and art books account for 25% of the total number of books. There are 80 more science and technology books than literature and art books. How many books are there in the school reading room?
学校阅览室的科技书占图书总数的35%，文艺书占图书总数的25%，科技书比文艺书多80本，学校阅览室共有图书多少本？
<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(7/20) - (1/4)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">80 / (1/10)</gadget>
<output>800</output>

<result>800</result>