There are a batch of books in Xinhua Bookstore. The first time to sell this batch of books (5/12), and the second time to sell the rest (3/7). At this time, there are still 120 books left in Xinhua Bookstore. This batch of books How many copies were there?
新华书店里有一批图书，第一次卖出这批图书的(5/12)，第二次卖出剩下的(3/7)，这时新华书店里还剩下120本，这批图书原来有多少本？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (5/12)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(7/12) * (4/7)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">120 / (1/3)</gadget>
<output>360</output>

<result>360</result>