Question
There were 34 pupils in a class. 21 of them got an A in a Chinese test. 21 of them got an A in a Science test. Every pupil got at least an A in the Chinese test or Science test. How many of them got an A in both the Chinese and Science tests?
4 m

Click button first when a symbol is required. X

There were 34 pupils in a class. 21 of them got an A in a Chinese test. 21 of them got an A in a Science test. Every pupil got at least an A in the Chinese test or Science test. How many of them got an A in both the Chinese and Science tests?