Multiple choice general knowledge math & puzzles

An old man was looking at a photograph of a young man. Somebody asked him who it was. The man's answer was the following: "Brothers and sisters, I have none. But that man's father is my father's son." Who was in the photograph?

  1. His cousin

  2. His nephew

  3. His son

  4. His grandfather
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The speaker says 'my father's son' and mentions he has no siblings, so 'my father's son' must be himself. Substituting this back into the riddle, the sentence becomes 'that man's father is me.' If the speaker is the father of the man in the photo, the man in the photo is his son.

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