There are three kinds of books in the book corner: story books, science books, and literature and art books. The number of story books accounts for (2/5) of the total, and the number of science and technology books is the number of literature and art books (3/4). The number of literature and art books is 20 fewer than the story books , How many books are there in the book corner?
图书角有故事书、科技书、文艺书三种书，故事书的本数占总数的(2/5)，科技书的本数是文艺书的(3/4)，文艺书比故事书少20本，图书角共有图书多少？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 + (3/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">(3/5) / (7/4)</gadget>
<output>12/35 = around 0.342857</output>

<gadget id="calculator">(2/5) - (12/35)</gadget>
<output>2/35 = around 0.057143</output>

<gadget id="calculator">20 / (2/35)</gadget>
<output>350</output>

<result>350</result>