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

B. 3

If the letter 'M' is the 13th letter, what is the 15th letter?

B. O

If the letter 'M' is the 13th letter, what is the letter that is 5 positions before it?

A. H

If the letter 'X' is the 24th letter of the alphabet, what is the 24th letter before 'X'?

A. A

If Z is the 26th letter, what is the 15th letter of the alphabet?

A. O