Question
There were 30 students in a class. 25 of them got an A in a Mathematics test. 12 of them got an A in a Chinese test. Every student got at least an A in the Mathematics test or Chinese test. How many of them got an A in both the Mathematics and Chinese tests?
4 m

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There were 30 students in a class. 25 of them got an A in a Mathematics test. 12 of them got an A in a Chinese test. Every student got at least an A in the Mathematics test or Chinese test. How many of them got an A in both the Mathematics and Chinese tests?