The school library bought a total of 1020 story books and technology books, of which 850 were story books. How many times were story books more than technology books?
学校图书室买来故事书和科技书共1020本，其中故事书有850本，故事书是科技书的多少倍？
<gadget id="calculator">1_020 - 850</gadget>
<output>170</output>

<gadget id="calculator">850 / 170</gadget>
<output>5</output>

<result>5</result>