The school bought a batch of books, of which literary books accounted for 60%. Later, I bought another 100 literature and art books, which accounted for 68% of the total. How many books did the school buy?
学校买来一批图书，其中文艺书占60%．后来又买了100本文艺书，这时文艺书占总数的68%．学校原来买了多少本书？
<gadget id="calculator">100 - 68</gadget>
<output>32</output>

<gadget id="calculator">0.68 - 0.6</gadget>
<output>0.08</output>

<gadget id="calculator">32 / 0.08</gadget>
<output>400</output>

<result>400</result>