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


Question

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

Options

A) 10

B) 5

C) 15

D) 20

The correct answer is D.

Explanation:

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

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