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In a survey of 50 newspaper readers, 40 read Champion and 30 read Guardian, how…

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
Correct Answer: Option D
Explanation

Let C n G = X
n C only = 40 – x
n G only = 30 – x
40 – X + 30 – X = 50
70 – X = 50X = 70 – 50X = 20