18,21,24,27.
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15 30 45 60 75 90
15, 30, and 45
multiples of 3 ... 21, 24, 27, 30 (between means leave out 30 multiples of 6 ... 24, 30 so the answer is 24
The common multiples of 3 and 15 from 1 to 100 are 15, 30, 45, 60, 75, 90
9, 12, 15, 18, 21, 24, 27, 30, 33.