The school library purchased 540 science fiction novels, which happened to be from literary magazines (9/10). How many more literary magazines than science fiction?
学校图书馆购进540本科幻小说，正好是文艺杂志的(9/10)．文艺杂志比科幻小说多多少本？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">540 / (9/10)</gadget>
<output>600</output>

<gadget id="calculator">600 - 540</gadget>
<output>60</output>

<result>60</result>