Question
There were 38 students in a class. 23 of them got an A in a History test. 21 of them got an A in a Chinese test. Every student got at least an A in the History test or Chinese test. How many of them got an A in both the History and Chinese tests?
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There were 38 students in a class. 23 of them got an A in a History test. 21 of them got an A in a Chinese test. Every student got at least an A in the History test or Chinese test. How many of them got an A in both the History and Chinese tests?