Question
There were 31 students in a class. 12 of them got an A in a Science test. 27 of them got an A in a History test. Every student got at least an A in the Science test or History test. How many of them got an A in both the Science and History tests?
4 m

Click button first when a symbol is required. X

There were 31 students in a class. 12 of them got an A in a Science test. 27 of them got an A in a History test. Every student got at least an A in the Science test or History test. How many of them got an A in both the Science and History tests?