JEE Main 2019 Mathematics question
Two newspapers A and B are published in a city. It is known that 25% of the city population reads A and 20% reads B while 8% reads both A and B. Further, 30% of those who read A but not B look into advertisements and 40% of those who read B but not A also look into advertisements, while 50% of those who read both A and B look into advertisements. Then the percentage of the population who look into advertisements is:
Answer: (A)
Solution
0.3(17) + 0.4(12) + 0.5(8) = 5.1 + 4.8 + 4 = 13.9%.