In a survey conducted in a locality, it was found that 50% read newspaper A, 40% read newspaper B, and 20% read neither A nor B. If the number of persons who read both A and B is 500, then how many persons were
surveyed?
Let the no. Of persons be N
50% of N = 0.5N
40% of N = 0.4 N
as we know that
total no. Persons =( A )person read newspaper + (B )person read newspaper - (AΠB)both read newspaper
N = 0.5N + 0.4 N - 500
0.1N = -500
N = 5000
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