Question 12
In a survey of coffee brands, $50\%$ drink brand $A$, $45\%$ brand $B$, $40\%$ brand $C$, $25\%$ both $A$ and $B$, $10\%$ both $B$ and $C$, $16\%$ both $A$ and $C$, and $8\%$ all three brands. What percentage of the consumers surveyed do not drink coffee?
For this exercise, every coffee drinker surveyed drinks at least one of A, B and C; pairwise overlaps include people who drink all three. This is the convention needed for the source question and key.
For this exercise, every coffee drinker surveyed drinks at least one of A, B and C; pairwise overlaps include people who drink all three. This is the convention needed for the source question and key.