The ratio of science books to story books in the school library is 2:3. There are 300 science books, but how many story books are there?
学校图书室科技书与故事书本数的比是2：3，科技书有300本，故事书有多少本？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">300 * (3/2)</gadget>
<output>450</output>

<result>450</result>