In the activity of "Creating Book Fragrant Campus", Li Xuan, a little "book fan", bought 12 more novel books than story books, and the number of story books was 40% of the novel books. How many new novel books did Li Xuan buy?
在"创书香校园"活动中，小"书迷"李萱新买的小说书比故事书多12本，故事书的本数是小说书的40%，李萱新买的小说书有多少本？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">12 / (3/5)</gadget>
<output>20</output>

<result>20</result>