There are 500 literary and artistic books in the library, and the scientific and technological books are literary and artistic books (3/5). How many scientific and technological books are there?
图书馆有文艺书500本，科技书是文艺书的(3/5)，科技书有多少本？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">500 * (3/5)</gadget>
<output>300</output>

<result>300</result>