Question

40 students of a class study either maths or statistics or both; 12 students take both subjects and 17 study only statistics.
1). how many students study maths ?
2). how many students study only maths?

Answer 1

Total number of students = 40

Total number of students that study both math and statistics = 12

Total number of students that study only statistic = 17

Find the number of students that study math:

*If student is taking ONLY statistic, the student is not taking math

Number of students = total - study statistic only

Number of students =40 - 17 = 23

Find the number of students that study only math:

*Student that study math but not both math and statistic

Number of students = study math - study both

Number of students =  23 - 12 = 11

Answer: (1) 23 (2) 11