In a race, Alex finished before Brian but after Charlie. David finished after Brian. Who finished first?

C. CHARLIE

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

A. 1

If M is the uncle of N and N is the daughter of O, what is M's relation to O?

C. BROTHER-IN-LAW

In a group of four people: X, Y, Z, and W, X is taller than Y but shorter than Z. W is shorter than X. Who is the tallest among them?

C. Z

How many times does the letter 'T' appear in the series: A, B, C, T, D, T, E, F, T, G?

B. 3