There are 420 science and technology books in the school library, which is 2/5 less than literature and art books. How many literature and art books are there in the school library?
学校图书室有科技书420本，比文艺书少(2/5)，学校图书室有文艺书多少本？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">420 / (3/5)</gadget>
<output>700</output>

<result>700</result>