There are 320 more literature books in Xinwen Bookstore than Encyclopedia books, and the remaining number of books is the same after a week of sales. There are still 4/5 literature books left, and 524 Encyclopedia knowledge books are sold. How many literature books are there?
新文书店的文学书比百科书多320本，销售一周后余下的本数相同，文学书还剩(4/5)，百科知识书卖出524本．文学书原有多少本？
<gadget id="calculator">524 + 320</gadget>
<output>844</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">844 / (1/5)</gadget>
<output>4_220</output>

<result>4_220</result>