Naughty bought a copy of "Fairy Tales" and a copy of "Mathematics World" in the bookstore and spent a total of 14.7 yuan. If a copy of "Fairy Tales" is 5.9 yuan, how much is a copy of "Mathematics World"?
淘气在书店买了一本《童话故事》和一本《数学世界》共花了14.7元，如果一本《童话故事》5.9元，一本《数学世界》多少元？
<gadget id="calculator">14.7 - 5.9</gadget>
<output>8.8</output>

<result>8.8</result>