In a survey of 50 newspaper readers, 40 read Champion and 30 read Guardian, how many read both papers?

  • A 10
  • B 5
  • C 15
  • D 20
jamb 2010mathematics

The correct answer is D. 20

Let C n G = X

n C only = 40 - x

n G only = 30 - x

40 - X + 30 - X + X  = 50

70 - X = 50

X = 70 - 50

X = 20

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