The school library bought back 600 new books, of which story books accounted for (1/3) and comic books (2/5), how many fewer story books than comic books?
学校图书馆买回新书600本，其中故事书占(1/3)，连环画占(2/5)，故事书比连环画少多少本？
<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">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">600 * (1/15)</gadget>
<output>40</output>

<result>40</result>