The school newly purchased 930 literature and art books, 350 more than the purchased science and technology books. How many science and technology books were purchased?
学校新购进930本文艺书，比购进的科技书多350本，购进科技书多少本？
<gadget id="calculator">930 - 350</gadget>
<output>580</output>

<result>580</result>