There are 240 story books in the school library, accounting for (1/5) of the total number of books, and 30 fewer science and technology books than (1/3) of the total number of books. How many technical books are there?
学校图书室有故事书240本，占图书总数的(1/5)，科技书比图书总数的(1/3)少30本．科技书有多少本？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">240 / (1/5)</gadget>
<output>1_200</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1_200 * (1/3)</gadget>
<output>400</output>

<gadget id="calculator">400 - 30</gadget>
<output>370</output>

<result>370</result>