In the school library, story books account for 65% of the total number of books, and technology trees account for 25% of the total number of books. There are 3,600 story books and technology books in total. How many books are there in the school library?
学校图书室中故事书占图书总数的65%，科技树占图书总数的25%，故事书和科技书一共有3600本，学校图书室一共有多少本图书？
<gadget id="calculator">65 / 100</gadget>
<output>13/20 = around 0.65</output>

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

<gadget id="calculator">(13/20) + (1/4)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">3_600 / (9/10)</gadget>
<output>4_000</output>

<result>4_000</result>