45. (It's also the least common multiple of the two.) Just keep counting by 45's, and each number will be divisible by 3, also:
90, (3 goes into it 30 times) 135, (3 goes into it 45 times) 180, (3 goes into it 60 times) and so on and so on.
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45 can be divided evenly by 1, 3, 5, 9, 15, and 45.
15, 30, 45, etc.
1, 3, 5, 9, 15, 45.
3?
72