There are 1,500 literature and art books in the library, 30 less than three times the number of science and technology books. How many science and technology books are there?
图书馆有文艺书1500本，比科技书的3倍少30本，科技书有多少本？
<gadget id="calculator">1_500 + 30</gadget>
<output>1_530</output>

<gadget id="calculator">1_530 / 3</gadget>
<output>510</output>

<result>510</result>