There are 400 literature and art books in the library, which is 1/3 more than science and technology books. How many science and technology books are there?
图书馆里有文艺书400本，比科技书多(1/3)，科技书有多少本？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">400 / (4/3)</gadget>
<output>300</output>

<result>300</result>