For each statement below, determine whether it is always true, sometimes true, or never true. Explain your answer. Mention examples and non-examples as appropriate. Justify your claim using algebra.
(i) Adding two even numbers can result in a number that is a multiple of \(3\).
(ii) If a number is not divisible by \(18\), then it is also not divisible by \(9\).
(iii) If two numbers are not divisible by \(6\), then their addition is not divisible by \(6\).
(iv) The sum of a multiple of \(6\) and a multiple of \(9\) is a multiple of \(3\).
(v) The total of a multiple of \(6\) and a multiple of \(3\) is a multiple of \(9\).