The school bought a batch of story books and distributed them to classes A, B, and C. Class A got (1/3) less than 30 books, and Class B got 10 more (2/5). The class is divided into 260 books. How many story books did the school buy in total?
学校买来一批故事书，分给甲、乙、丙三个班，甲班分得总数的(1/3)少30本，乙班分得总数的(2/5)多10本，丙班分得260本．学校一共买来多少本故事书？
<gadget id="calculator">260 - 30</gadget>
<output>230</output>

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