I agree with you - there is a logical inconsistency here. If we number the statements 1 through 8, starting with statement #1 being "there are 30 people on a tour bus," then we know that there 8 passengers > 30 years old (from #3), and that among them there is 1 Australian male (from #4), 2 non-Australian males (#7), and 6 Australian females (from #6 combind with #8). So - either the answer involves hermaphroditic bus riders or there is an error in the problem statement.