In a class of 80 students, every student had to study Economics or Geography or both Economics and Geography. lf 65 students studied Economics and 50 studied Geography, how many studied both subjects?

  • A 15
  • B 30
  • C 35
  • D 45
  • E 50
waec 1991mathematics

The correct answer is C. 35

Applying the formula

80 = 65 - x + x + 50 - x

x = 35

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