In a family, there are three siblings: X, Y, and Z. X is older than Y but younger than Z. If Z is a doctor and Y is a teacher, what is X's profession?

C. UNKNOWN

If the letter 'Z' is the 26th letter, what is the 20th letter of the alphabet?

A. T

In the pattern 3, 6, 9, ?, 15, 18, what is the missing number?

B. 12

Choose the odd letter group: LMN, OPQ, RST, UVW, XYZ

D. UVW

What is the sum of the roots of the quadratic equation x² - 5x + 6 = 0?

A. 5
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