A school library has a batch of story books and science books, and the number of story books is three times that of science books. After lending out 220 story books and science books, the number of story books is five times that of science books. How many original technical books.
某校图书馆存有一批故事书和科技书，故事书的本数是科技书的3倍，借出故事书和科技书各220本后，这时故事书本数是科技书的5倍，图书馆原有科技书多少本．
<gadget id="calculator">220 * 5</gadget>
<output>1_100</output>

<gadget id="calculator">1_100 - 220</gadget>
<output>880</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">880 / 2</gadget>
<output>440</output>

<result>440</result>