The school library purchased 360 new books after lending out 40% of the original batch of books. At this time, the ratio of unloaned books to original books is 3:4. How many books have you borrowed?
学校图书馆原有一批图书，借出40%以后，又购进新书360本，这时未借出的书和原来的书是3：4．借出去图书有多少本？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/4) - (3/5)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">360 / (3/20)</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 * (2/5)</gadget>
<output>960</output>

<result>960</result>