Question
There were 30 students in a class. 22 of them got an A in a Science test. 25 of them got an A in a Mathematics test. Every student got at least an A in the Science test or Mathematics test. How many of them got an A in both the Science and Mathematics tests?
4 m

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There were 30 students in a class. 22 of them got an A in a Science test. 25 of them got an A in a Mathematics test. Every student got at least an A in the Science test or Mathematics test. How many of them got an A in both the Science and Mathematics tests?