Multiple choice general knowledge math & puzzles

If D is the brother of B, how B is related to C? To answer this question which of the statements is/are necessary? 1. The son of D is the grandson of C. 2. B is the sister of D.

  1. Only 2

  2. 1 and 2 both are required

  3. Either 1 or 2

  4. Only 1
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement 1 establishes C is D's grandparent. Statement 2 establishes B is D's sister. Both are needed: with only statement 1, we don't know if B is male or female; with only statement 2, we don't know how D relates to C. Combined, B is D's sister and D's granddaughter, making B C's granddaughter.

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