The number of science and technology books in the library is 3/5 that of literature and art books. Later, 560 science and technology books were bought back. Now literature and art books account for 45% of the total of the two kinds of books. How many books are there in total now?
图书馆里的科技书本数是文艺书的(3/5)，后来又买回科技书560本，现在文艺书占两种书总数的45%．现在两种书一共有多少本？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (9/20) - (3/8)</gadget>
<output>7/40 = around 0.175</output>

<gadget id="calculator">560 / (7/40)</gadget>
<output>3_200</output>

<result>3_200</result>