There are 3,500 story books in the school library, which is 100 more than twice the number of popular science books. How many popular science books does the school have?
学校图书室有故事书3500本，比科普书的2倍还多100本，学校有科普书多少本？
<gadget id="calculator">3_500 - 100</gadget>
<output>3_400</output>

<gadget id="calculator">3_400 / 2</gadget>
<output>1_700</output>

<result>1_700</result>