Both Wang Liang and Li Jing want to buy a book, Wang Liang is short of 4.8 yuan, Li Jing is short of 5.2 yuan, and their combined money is just enough to buy this book. How much is this book?
王亮和李京都想买一本书，王亮缺4.8元，李京缺5.2元，而他们两人的钱合起来刚好够买这本书．这本书多少钱？
<gadget id="calculator">4.8 + 5.2</gadget>
<output>10</output>

<result>10</result>