There are 80 science and technology books and 120 literature and art books in the library of the first class of the sixth grade. What percentage of the total number of literature and art books account for the total number of science and technology books and literature and art books?
六年级一班红领巾图书馆有科技书80本，文艺书120本，文艺书的本数占科技书和文艺书总数的百分之几？
<gadget id="calculator">120 + 80</gadget>
<output>200</output>

<gadget id="calculator">120 / 200</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>