In an area, of the total people 40\% were women and 45\% coffee drinkers. One-third of the males are coffee drinkers. Suppose the total number of persons in the area is 100, then the number of female noncoffee drinkers is
(a)15
(b)20
(c)25
(d)None of these
Answer
Answer (as printed): A
Explanation
Number of women $=40 \%$ of $100=40$. Number of men $=(100-40)=60$. Number of coffee-drinkers $=45 \%$ of $100=45$. Number of male coffee-drinkers $=\frac{1}{3}$ of $60=20$. Number of female coffee-drinkers $=(45-20)=25$. ∴ Number of female non-coffee drinkers $=(40-25)=15$.
Explanation as extracted from the printed page; notation may be imperfect.