There are 562 story books in the school library, 208 more than literature and art books, and the number of children's science and technology books is exactly twice that of literature and art books. How many science and technology books are there in the school library?
学校图书室有故事书562本，比文艺书多208本，少儿科技书一本数正好是文艺书的2倍，学校图书室共有科技书多少本？
<gadget id="calculator">562 - 208</gadget>
<output>354</output>

<gadget id="calculator">354 * 2</gadget>
<output>708</output>

<result>708</result>