There are 2400 story books in the library, which is more than the number of science and technology books (1/5). How many technical books are there?
图书馆有故事书2400册，比科技书的本数多(1/5)．科技书有多少本？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">2_400 / (6/5)</gadget>
<output>2_000</output>

<result>2_000</result>