The school bought 150 books, among which story books accounted for (1/3) and comic books accounted for (1/5). How many more story books were bought than comic books?
学校买来150本书，其中故事书占(1/3)，连环画占(1/5)，买来的故事书比连环画多多少本？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) - (1/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">150 * (2/15)</gadget>
<output>20</output>

<result>20</result>