The school bought 54 new books, of which science and technology books accounted for (1/6), literature and art books accounted for (1/2), how many more literature and art books than science and technology books?
学校买来54本新书，其中科技书占(1/6)，文艺书占(1/2)，文艺书比科技书多多少本？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/2) - (1/6)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">54 * (1/3)</gadget>
<output>18</output>

<result>18</result>