There are 320 popular science books in the library, accounting for (2/3) of all books. How many books are there in the library?
图书馆有科普读物320本，占全部图书的(2/3)，图书馆里全部图书有多少本？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">320 / (2/3)</gadget>
<output>480</output>

<result>480</result>