The library bought a batch of new books, of which story books accounted for (1/6), literature and art books accounted for 400, and the rest were science and technology books. We also know that the ratio of literature and art books to science and technology books is 5:4. How many new books are there in total?
图书馆买来一批新书，其中故事书占(1/6)，文艺书是400本，其余的是科技书，又知文艺书和科技书的比是5：4．这批新书共有多少本？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(5/6) * (5/9)</gadget>
<output>25/54 = around 0.462963</output>

<gadget id="calculator">400 / (25/54)</gadget>
<output>864</output>

<result>864</result>