In a library, fairy tale books account for 25% of the total number of books, science and technology books account for 15% of the total number of books, and there are 230 fairy tale books and science and technology books. How many books are there in this library?
某图书馆的童话书占图书总数的25%，科技书占图书总数的15%，童话书和科技书共有230本．这个图书馆共有图书多少本？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(1/4) + (3/20)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">230 / (2/5)</gadget>
<output>575</output>

<result>575</result>