Identify the missing letter in the series: Z, X, V, T, ?

B. S

If A is the brother of B, and B is the sister of C, what is the relationship of A to C?

A. BROTHER

In the sequence 3, 6, 9, 12, 15, 18, how many times does the number 12 occur?

A. 1

In the sequence 5, 10, 15, 20, 25, 30, how many times does the number 25 appear?

A. 1

In a code language, 'FISH' is represented as '61489'. What is the code for 'BIRD' if 'B' is 2, 'I' is 9, 'R' is 18, and 'D' is 4?

A. 29184