Can You Solve The Lying And Truth-Telling Strangers Logic Puzzle?

This logic puzzle was found in "Fundrum My Conundrum: A Book of Riddles" by Ray Epstein and Ben Kovler. It's labeled as a puzzle with medium difficulty, but we'll let you decide that. Scroll down to read the puzzle and keep scrolling to learn the answer.

Here's The Puzzle

You meet two strangers: a good guy who always tells the truth, and a bad guy who always lies. You ask the first guy if he is a truth teller, and he mumbles an answer that you can't quite make out. The second guy then looks at you and says, "He said yes, but he's a liar." Which one is the good guy who always tells the truth? Scroll down to read the answer.

Here's The Answer

The first guy (the one who mumbled his answer) is the bad guy who always lies, and the second guy is the truth-telling good guy. The first guy must have answered "yes" regardless if he was a good guy or bad guy. Because the second guy told you that the first guy said yes, we know he was telling the truth. Therefore, the second guy must be the good guy.

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Written by Curiosity Staff May 25, 2017