There are a total of 150 books in the class library, of which story books and science books account for 90% of the total number of books, and the rest are literary books. How many literary books are there?
班级图书室一共有150本图书，其中故事书和科技书的本数占图书总数的90%，其余的都是文艺书，文艺书有多少本？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">150 * (1/10)</gadget>
<output>15</output>

<result>15</result>