60
Subtract 1/2
30
Subtract 1/3
20
Subtract 1/4
15
Subtract 1/5
12
Now subtract 1/6
The next number is 10.
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10 ten
The series alternates between two sequences: one that increases by 1 (11, 12, 13, 14) and another that increases by 1 as well but starts from 2 (2, 3, 4). Following this pattern, the next number in the increasing sequence would be 15, and the next number in the second sequence would be 5. Therefore, the next numbers in the series would be 15 and 5.
Since each number is one less than the one before it, the next number would be 8.
-5
The next number is -21