You have three closed boxes labeled 'Apples', 'Oranges', and 'Mix'. Every label is guaranteed to be wrong. You are allowed to pull out only one fruit from only one box without looking inside. Which box should you pick a fruit from to correctly identify the contents of all three boxes?
The box labeled 'Mix'
Because the 'Mix' label is wrong, that box contains either only apples or only oranges. Pulling one fruit reveals its true contents. For example, if you draw an apple, the box labeled 'Mix' is actually 'Apples'. Then the box labeled 'Oranges' cannot be Oranges (label is wrong) nor Apples (already found), so it must be 'Mix', leaving the 'Apples' box as 'Oranges'.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Medium. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
More logic riddles
A line goes: clover, gold coin, clover, gold coin, clover. What comes next?
You are shown four cards laying on a table showing '3', '8', 'Red', and 'Blue'. Each card has a number on one side and a color on the other. Which card or cards MUST you flip over to test the rule: 'If a card shows an even number on one side, then its opposite side is Red'?
Leo, Maya, and Nina each play a different sport: tennis, soccer, and chess. Leo does not play soccer. Maya does not play chess, and she hates tennis. What sport does Maya play?
I lead Santa's sleigh with a glowing red nose. Who am I?
In a village of truth-tellers (who always tell the truth) and liars (who always lie), you meet two inhabitants, Pip and Pop. Pip says, 'At least one of us is a liar.' What are Pip and Pop?
I am a big stuffed animal that you hug, and I'm often holding a heart. What am I?