There are a new batch of new books in the library, of which story books account for (2/5), and the rest are comic books and literary books. The ratio of comic books to literary books is 4:5. There are 400 known comic books. How many new books are there in this batch?
图书室新进一批新书，其中故事书占(2/5)，其余是连环画和文艺书，连环画和文艺书的比是4：5，己知连环画有400本，这批新书共有多少本？
<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">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(3/5) * (4/9)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">400 / (4/15)</gadget>
<output>1_500</output>

<result>1_500</result>