The school library bought a total of 1,800 story books and technology books, and the number of story books is three times that of technology books. How many technology books are there?
学校图书馆共买来故事书和科技1800本，其中故事书的本数是科技书的3倍，科技书有多少本？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">1_800 / 4</gadget>
<output>450</output>

<result>450</result>