Four books are stacked on a shelf. The red book is directly on top of the blue book. The green book is somewhere beneath the yellow book. The blue book is somewhere above the green book. Which book is at the very bottom of the stack?
The green book
From top to bottom, the red book is above the blue book (Red, Blue). The blue book is above the green book (Blue, Green). The green book is beneath the yellow book (Yellow, Green). Combining these clues gives the vertical order from top to bottom: Yellow, Red, Blue, Green. Therefore, the green book is at the bottom.
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.
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