There are 650 story books in the library of Zhonghua Avenue Primary School, the number of science books is (3/5) of story books, and the number of literature and art books is (1/2) of science and technology books. How many literature and art books are there?
中华大街小学图书室有故事书650本，科技书的本数是故事书的(3/5)，文艺书的本数是科技书的(1/2)，文艺书有多少本？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">650 * (3/5) * (1/2)</gadget>
<output>195</output>

<result>195</result>