There are 3,000 books in the school library, among which science and technology books account for (3/10), literature and art books are science and technology books (5/9), how many literature and art books are there?
学校图书室里有图书3000册，其中科技书占(3/10)，文艺书是科技书的(5/9)，有文艺书多少册？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">3_000 * (3/10) * (5/9)</gadget>
<output>500</output>

<result>500</result>