Fangfang and Tingting go to buy the same book, Fangfang is 3.5 yuan less, Tingting is 2.8 yuan less, if the two people’s money is combined to buy this book, what is the unit price of this book?
芳芳和婷婷去买同一本书，芳芳少3.5元，婷婷少2.8元，如果两人的钱合起来正好买这本书，这本书的单价是多少？
<gadget id="calculator">3.5 + 2.8</gadget>
<output>6.3</output>

<gadget id="calculator">1 - 1</gadget>
<output>0</output>

<gadget id="calculator">1 + 0</gadget>
<output>1</output>

<gadget id="calculator">6.3 / 1</gadget>
<output>6.3</output>

<result>6.3</result>