Four books—Red, Green, Blue, and Yellow—are arranged on a shelf from left to right. 1. The Red book is to the left of the Green book. 2. The Blue book is between the Red book and the Yellow book. 3. The Yellow book is not at either end of the shelf. What is the exact order of books from left to right?
Red, Blue, Yellow, Green
Yellow cannot be on either end, placing it in position 2 or 3. Blue is between Red and Yellow, so the sequence of those three must be Red, Blue, Yellow. Position 4 must be Green so Red remains to the left of Green. This places Red in position 1, Blue in 2, Yellow in 3, and Green in 4.
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: Hard. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
More logic riddles
Four siblings—Amy, Ben, Chloe, and Dan—each brought a different pet to school: a cat, a dog, a bird, and a fish. - The owner of the fish is a boy. - Amy is allergic to fur and feathers. - Ben is afraid of dogs. What pet did Chloe bring?
Alice, Bob, Charlie, and Diana sit around a square table facing inward, with one person on each side. Alice sits directly opposite Charlie. Bob sits to the immediate right of Alice. Who sits to the immediate right of Diana?
Four knights participate in a jousting tournament resulting in distinct ranks from 1st to 4th. Sir Kay did not finish last. Sir Lancelot finished immediately ahead of Sir Gawain. Sir Bors finished 2nd. Who finished in 1st place?
In a simple letter substitution system based on numerical values, CAT is coded as 24, and DOG is coded as 26. What is the code for PIG?
A sequence of numbers follows a strict logical rule: 1, 11, 21, 1211, 111221. What is the next number in the sequence?
The scarecrow is smaller than the squirrel, and the squirrel is smaller than the autumn leaf. Which one is the biggest?