In the library collection of Guangming Primary School, story books account for (2/5) and science and technology books account for (1/3). What percentage of the library's collection do the rest of the books account for?
在光明小学图书馆的藏书中，故事书占(2/5)，科技书占(1/3)．剩下的其它书占图书馆藏书的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">1 - (2/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>