Mr. Blue, Mr. White, and Mr. Gray are wearing shirts and ties that are blue, white, or gray. Each man’s tie contrasts in color with his shirt, and neither the shirt nor tie matches the man’s name. If Mr. Blue’s tie is the same color as Mr. Gray’s shirt, what is the color of Mr. White’s shirt?
Mr. Blue’s tie and Mr. Gray’s shirt can be neither blue nor gray, hence are white. Thus Mr. Blue’s shirt has to be gray (not blue or white), and the only shirt color not accounted for is Mr. White’s, which must be blue.