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
waec 2001mathematics

The correct answer is C. 35

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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