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: Option C
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.