The ratio of the number of literature and art books to science and technology books is 3:2, so how much more literature and art books than science and technology books?
文艺书和科技书的本数的比为3：2，那么文艺书比科技书多多少．
<gadget id="calculator">3 - 2</gadget>
<output>1</output>

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

<result>1/2 = around 0.5</result>