Answer = 20%
Step-by-step explanation:
% of TV = 65%
% of Newspaper = 40%
% of TV + Newspaper = 25%
% of TV but not Newspaper = 65% - 25% = 40%
% of Newspaper but not TV = 40% - 25% = 15%
% of TV only + Newspaper only + TV and Newspaper = 40% + 15% + 25% = 80%
% of neither TV nor Newspaper = 100% - 80% = 20%