The head teacher said: 9 students got 100 points in Chinese, 8 students got 100 points in mathematics, and 5 students got full marks in language and mathematics. How many people got 100 points?
班主任老师说：这次考试语文100分的有9人，数学100分的有8人，语、数都满分的同学有5人，得到100分的有多少人．
<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">9 + 3</gadget>
<output>12</output>

<result>12</result>