The school has a new batch of books, sorted (1/3) on the first day, and sorted (1/4) the next day, and there are 3000 books left. How many books are there in this batch?
学校新进了一批图书，第一天整理了(1/3)，第二天整理了(1/4)，还剩3000本，这批书一共有多少本？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">1 - (1/3) - (1/4)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">3_000 / (5/12)</gadget>
<output>7_200</output>

<result>7_200</result>