For a hypothetical magazine, the probability that the reader is male given that the reader is at least 35 years old is 0.30. The probability that a reader is male, given that the reader is under 35, is 0.65. If 75% of the reader are under thirty five what is the probability that a randomly chosen reader is
(a) male
(b) female
(c) under 35 if it is given the reader is a female