Numerical sequence test

In a numerical sequence test it is necessary to identify a pattern that is occurring in the sequence.
The numbers in the sequence may be progressing, or they may be decreasing. In some cases they may be both progressing and decreasing within the sequence, and in some cases two separate sequences may be interwoven. It is up to you to determine which of these is occurring and to continue the sequence by providing
the missing number(s) indicated by the question mark(s) in each question.
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1.
0, 1, 2, 3, 5, 7, 9, 12, 15, 18, ?
2.
3, 6, 12, 21, 33, ?
3.
1000, 975, 925, 850, 750, ?
4.
1, 10, 2.5, 7.5, 4, 5, ?, ?
5.
12, 8.5, 5, 1.5, ?
6.
8, 16, 64, 128, 512, 1024, ?
7.
12, 11, 9, 6, 2, ?
8.
1, 1.5, 3, 7.5, 21, ?
9.
2, 6, 9, 27, 30, 90, 93, ?
10.
5, 6, 7, 8, 10, 12, 14, 20, ?, ?
11.
100, 99, 96, 91, 84, 75, 64, ?
12.
19, 38, 57, 76, 95, 114, ?
13.
2, 5, 12, 27, 58, 121, ?
14.
10, 9.75, 9.25, 8.5, 7.5, 6.25, ?
15.
10, 11.75, 9.25, 11, 8.5, ?

Answers

1. 22
Add 1, 1, 1, 2, 2, 2, 3, 3, 3, 4.
2. 48
Add 3, 6, 9, 12, 15.
3. 625
Deduct 25, 50, 75, 100, 125.
4. 5.5, 2.5
There are two interwoven sequences: starting at 1 add 1.5;
starting at 10 deduct 2.5.
5. –2
Deduct 3.5 at each stage.
6. 4096
×2, ×4 repeated
7. –3
–1, –2, –3, –4, –5
8. 61.5
The amount added on is multiplied by 3 each time, ie 0.5,
1.5, 4.5, 13.5, 40.5.
9. 279
×3, +3 repeated.
10. 19, 36
There are two interwoven sequences: starting at 5 add 2, 3, 4,
5; starting at 6 add 2, 4, 8, 16.
11. 51
Deduct 1, 3, 5, 7, 9, 11, 13.
12. 133
Add 19 each time.
13. 248
×2+1, ×2+2, ×2+3, ×2+4, ×2+5, ×2+6
14. 4.75
–0.25, –0.5, –0.75, –1, –1.25, –1.5
15. 10.25
1.75, –2.5, +1.75, –2.5, +1.75