Puzzles/Non-scientific puzzles/Boy and Girl/Solution

From Wikibooks, open books for an open world
< Puzzles‎ | Non-scientific puzzles‎ | Boy and Girl
Jump to navigation Jump to search

Puzzles | Non-Scientific Puzzles | Boy and Girl | Boy and Girl Solution


If only one of them had lied, we'd have to conclude that both are boy or both are girl. This is impossible, so both of them must have lied. Therefore, the child with the black hair is the girl, and the child with the white hair is the boy.