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27.5 (3.5, 5.5, 7.5, 9.5...)
5
425
63
The next number in the sequence is 48.
The next number in the sequence would be 25.
35
It is 129.
15
6 12 9 18 15 30 27 54 51
75. The sequence is:- multiply by three, divide by two, add one.
15 30 32