x 15 is one possibility
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27, 33, and 39. The pattern adds 6 each time
The next number in this sequence should be 33.
Each number is decreasing by 3. The next numbers in the sequence would be -18, -21, -24, -27, -30.
243
21 over 27 is the same as 21 divided by 27:21/27 = 21 ÷ 27 = 0.777778