The price of a copy of "Fairy Tales" is 8.3 yuan, which is 1.5 yuan cheaper than a copy of "Folk Tales". How much does it cost to buy these two books?
一本《童话故事》的价格是8.3元，比一本《民间故事》便宜1.5元，买这两本书一共要多少钱？
<gadget id="calculator">8.3 + 1.5 + 8.3</gadget>
<output>18.1</output>

<result>18.1</result>