There are 800 books in the school library, of which popular science books account for the total (2/5), and story books are popular science books (3/4). How many story books are there in the library?
学校图书馆有800本图书，其中科普读物占总数的(2/5)，故事书是科普类的(3/4)，图书馆有多少本故事书？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">800 * (2/5) * (3/4)</gadget>
<output>240</output>

<result>240</result>