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In a class of 80 students, every students studies Economics or Geography or both. If…

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.

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