Xinhua Bookstore shipped a batch of books, sold this batch of books on the first day (5/12), sold 240 books on the second day, and left the total number (1/4). How many books are there in total?
新华书店运来一批图书，第一天卖出这批图书的(5/12)，第二天卖出240本，还剩总数的(1/4)．这批图书共有多少本？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

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

<gadget id="calculator">1 - (5/12) - (1/4)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">240 / (1/3)</gadget>
<output>720</output>

<result>720</result>