Obviously, I spent 2.50 yuan to buy the picture book, and now I have 8 yuan left. How much did Mingming originally have?
明明买图画本用了2.50元，现在还剩下8元．明明原来有多少元？
<gadget id="calculator">2.5 + 8</gadget>
<output>10.5</output>

<result>10.5</result>