There are 45 books in the Book Corner, of which science and technology books account for (1/5). How many technical books are there?
图书角有45本书，其中科技书占(1/5)．科技书有多少本本．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">45 * (1/5)</gadget>
<output>9</output>

<result>9</result>