The school bought a batch of science and art books, among which there were 168 science and technology books, accounting for (4/9) of the total. How many literary books did you buy?
学校买了一批科技书和文艺书，其中科技书有168本，占买来总数的(4/9)．买来文艺书多少本？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">168 / (4/9)</gadget>
<output>378</output>

<gadget id="calculator">378 - 168</gadget>
<output>210</output>

<result>210</result>