2010
Mathematics
67ca00ce0c643c71d77dee1f
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: 20
Explanation
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
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 = 20THIS WEEK's
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