There are a new batch of new books in the library, of which story books account for (1/6), and the rest are comic books and literary books. The ratio of comic books to literary books is 3:4. There are 400 known literary books. How many are there in this batch of new books? ?
图书室新进一批新书，其中故事书占(1/6)，其余是连环画和文艺书，连环画和文艺书的比是3：4，己知文艺书有400本，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">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(5/6) * (4/7)</gadget>
<output>10/21 = around 0.47619</output>

<gadget id="calculator">400 / (10/21)</gadget>
<output>840</output>

<result>840</result>