If the letter 'X' is the 24th letter of the alphabet, what is the letter that comes immediately before it?

A. W

How many times does the letter 'E' appear in the series: A, B, C, D, E, E, F, G, E?

A. 2

If the 15th letter of the alphabet is replaced by 'X', what is the new letter at that position?

C. X

In the sequence A, B, C, D, E, F, G, which letter is in the 12th position?

A. L

In the sequence A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, how many times does the letter 'A' appear?

A. 1