The pattern you've provided appears to involve decreasing numbers with a common difference. Let's analyze it:
- 81
- 69 (81 - 12)
- 58 (69 - 11)
- 48 (58 - 10)
- 39 (48 - 9)
It seems that each number is decreasing by 1 less than the previous step. So, to find the next number, subtract 8 from 39:
39 - 8 = 31
So, the next number in the pattern is 31.