The school is carrying out the "Reading Good Books and Good News Activities", and newly bought a batch of literary books and distributed them to three classes in the sixth grade. It is known that the first class gets 30 books less than the total (1/3), the second class gets 10 more books (2/5), and the third class gets 260 books. How many books are there in total?
学校在开展"读好书好报活动"中，新买来一批文艺书，分给六年级三个班．已知一班分得总数的(1/3)少30本，二班分得总数的(2/5)多10本，三班分得260本．这批文艺书一共有多少本？
<gadget id="calculator">260 - 30</gadget>
<output>230</output>

<gadget id="calculator">230 + 10</gadget>
<output>240</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">240 / (4/15)</gadget>
<output>900</output>

<result>900</result>