There are 150 literature and art books in the library, and 10 fewer science and technology books than it (2/5). How many science and technology books are there?
图书室里有150本文艺书，科技书比它的(2/5)还少10本，科技书有多少本？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">150 * (2/5)</gadget>
<output>60</output>

<gadget id="calculator">60 - 10</gadget>
<output>50</output>

<result>50</result>