There are 320 science and technology books in the school library, accounting for (2/5) of all books, and story books account for (3/4) of all books. How many story books are there in the library?
学校图书室有科技书320本，占全部图书的(2/5)，故事书又占全部图书的(3/4)．图书室有多少故事书？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">320 / (2/5)</gadget>
<output>800</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">800 * (3/4)</gadget>
<output>600</output>

<result>600</result>