There are 250 science and technology books in the school library, and the number of story books is more than that of science and technology books (2/5). How many story books are there in the school library?
学校图书室有科技书250本，故事书的本数比科技书多(2/5)，学校图书室里有故事书多少本？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">250 * (7/5)</gadget>
<output>350</output>

<result>350</result>