You have male + female = 100%, and the proportion of people who have been in an accident = 40%, overlapping both male and female, which are mutually exclusive areas. 55% male gives us 45% female. 67% of the population belongs in the union of the female and accident areas, but we know that 45% is female, so 22% of the population is not female but has been in an accident, hence 22% of the population is male and has been in an accident, and 18% is female and has been in an accident. That gives us 37% is male and has not been in an accident and 27% is female and has not been in an accident.