In an exam, 5 people got 100 points in Chinese, and 8 people got 100 points in mathematics. The teacher found that only 10 people got 100 points in this exam. Then, how many people got double 100 points?
一次考试，语文得100分的有5人，数学得100分的8人，老师发现这次考试得100分的只有10人，那么，得双100分的有多少人．
<gadget id="calculator">8 - 10</gadget>
<output>-2</output>

<gadget id="calculator">5 + (-2)</gadget>
<output>3</output>

<result>3</result>