There are 12,000 science books, literary books and story books in the school library, of which science books account for (1/10), the ratio of science books to story books is 2:3, how many story books are there?
学校图书馆的科技书、文艺书和故事书共12000本，其中科技书占(1/10)，科技书与故事书的比是2：3，故事书有多少本？
<gadget id="calculator">2 + 15 + 3</gadget>
<output>20</output>

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">12_000 * (3/20)</gadget>
<output>1_800</output>

<result>1_800</result>