The sequence starts with the numbers: 25, 20, 16, 13, 11. It appears that the numbers are decreasing with a decreasing step:
- From 25 to 20, the difference is 5.
- From 20 to 16, the difference is 4.
- From 16 to 13, the difference is 3.
- From 13 to 11, the difference is 2.
Following this pattern, the next difference would be 1. Therefore:
11 - 1 = 10.
So, the next number in the sequence is 10.
The numbers following include 9 and 8, which continue the decreasing pattern if those were intended to follow after the sequence.