A copy of "Fairy Tales" is 3.2 yuan, and a copy of "Mathematics World" is 11.5 yuan. How much more is a copy of "Mathematics World" than a copy of "Fairy Tales"?
一本《童话故事》3.2元，一本《数学世界》11.5元，一本《数学世界》比一本《童话故事》贵多少元？
<gadget id="calculator">11.5 - 3.2</gadget>
<output>8.3</output>

<result>8.3</result>