Three boxes contain marbles. Box 1 has 5 red marbles. Box 2 has 5 blue marbles. Box 3 has 3 red and 2 blue marbles. All boxes have labels, but all labels are swapped and incorrect. You blindly draw one marble from the box labeled 'Red and Blue'. What color is it, and which box is it actually?
Red, and it is the box containing only Red marbles
The box labeled 'Red and Blue' cannot actually contain mixed marbles because all labels are incorrect. Therefore, it must contain either only red or only blue marbles. Drawing a red marble proves this box contains exclusively red marbles.
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
Four runners—A, B, C, and D—finished a race. C finished immediately before A. D was not last, but finished after B. Who won the race?
If five machines take five minutes to make five widgets, how long does it take one hundred machines to make one hundred widgets?
A man pushes his car up to a hotel and tells the owner he is bankrupt. Why?
A gardener places four distinct flowers in a single row: a Rose, a Lily, a Tulip, and a Daisy. The Rose is not at either end. The Daisy is at the far right end. The Lily is placed immediately to the right of the Rose. What is the exact left-to-right order of the flowers?
An island has only two kinds of inhabitants: Knights, who always tell the truth, and Knaves, who always lie. You meet two islanders, Alex and Blair. Alex says, 'At least one of us is a Knave.' What are Alex and Blair?
Five light bulbs numbered 1 to 5 are all initially turned off. Switch 1 toggles bulb 1. Switch 2 toggles bulbs 1 and 2. Switch 3 toggles bulbs 1, 2, and 3, and so on up to Switch 5. If you flip Switch 2, then Switch 4, then Switch 5, which bulbs remain ON?