There are 420 books on the shelf. Among them, there are 120 scientific and technological books, and the rest are literature and art books. What percentage of the total number of literature and art books?
书架上有420本书．其中科技书有120本，其余是文艺书，文艺书占总数的几分之几？
<gadget id="calculator">420 - 120</gadget>
<output>300</output>

<gadget id="calculator">300 / 420</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>