It is 30; the first, third, and fifth numbers form the sequence 12, 18, 24. The second, fourth, and sixth numbers follow the sequence 11, 14, 17. Logically, the seventh number must be 24 + 6, so 30.
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23
30
The answer depends on where, within the sequence, the missing number should have been.
12. Numbers on a clock face.
12