In a class of 80 students, every students studies Economics or Geography or both. If
MATHEMATICS
WAEC 2001
In a class of 80 students, every students studies Economics or Geography or both. If 65 students study Economics and 50 study Geography, how many study both subjects?
- A. 15
- B. 30
- C. 35
- D. 45
Correct Answer: C. 35
Explanation
Let c = no of students that offered both subjects
\(\therefore\) No of students offering Economics = 65 - c
No of students offering Geography = 50 - c
65 - c + c + 50 - c = 80
115 - c = 80
c = 35
35 students offer both Economics and Geography.
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