The school bought a batch of books, of which literature and art books accounted for 1/3 of the total, and science and technology books accounted for 25% of the total, and literature and art books accounted for 40 more than science and technology books. How many books are there in this batch?
学校买来一批图书，其中文艺书占总数的(1/3)，科技书占总数的25%，文艺书比科技书多40本．这一批图书共有多少本？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">40 / (1/12)</gadget>
<output>480</output>

<result>480</result>