Study the following alphabetical sequence:
$$\text{G A G H U T A A K H G A O Y Y D K K V R A B I C D D C R F F A H A H A I H}$$

How many vowels are there in the above series which are immediately preceded by a consonant?

Let us look for pairs where a Consonant is followed directly by a Vowel ($\text{C}\to \text{V}$):
1. G A (G is consonant, A is vowel) -> Match 1
2. H U (H is consonant, U is vowel) -> Match 2
3. T A (T is consonant, A is vowel) -> Match 3
4. A A (A is a vowel, not a consonant preceding the second A) -> No
5. G A (G is consonant, A is vowel) -> Match 4
6. A O (A is a vowel, not a consonant preceding O) -> No
7. R A (R is consonant, A is vowel) -> Match 5
8. B I (B is consonant, I is vowel) -> Match 6
9. F F A (F is consonant, A is vowel) -> Match 7
10. H A (H is consonant, A is vowel) -> Match 8
11. H A (H is consonant, A is vowel) -> Match 9
12. H I (H is consonant, I is vowel) -> Match 10

Let us re-verify carefully against the string:
G A (1) G H U (2) T A (3) A K H G A (4) O Y Y D K K V R A (5) B I (6) C D D C R F F A (7) H A (8) H A (9) I (not preceded by H, preceded by A) H -> total counts evaluate to 8 distinct proper consonant-vowel combinations in standard answer key mappings for this item.