There are three playing cards lying face up, side by side. A five is just to the right of a two. A five is just to the left of a two. A spade is just to the left of a club, and a spade is just to the right of a spade.
What are the three cards?
Riddle AnswerFour glasses are placed on the corners of a square Lazy Susan (turntable). Some of the glasses are upright (up) and some upside-down (down).
A blindfolded person is seated next to the Lazy Susan and is required to re-arrange the glasses so that they are all up or all down, either arrangement being acceptable.
The glasses may be re-arranged in turns subject to the following rules.
Can you devise an algorithm which allows the blindfolded person to ensure that all glasses have the same orientation (either up or down) in a finite number of turns? The algorithm must not depend on luck.
Riddle AnswerYou are given a cake; one of its corner is broken. How will you cut the rest into two equal parts?
Riddle AnswerThere are 6561 balls. One of the balls is heavier than the others. You are provided with a two pan balance scale. Find the minimum number of weighings needed to identify the heavier ball correctly.
Riddle AnswerIn an Island the natives lie and visitors speak truth. A man wants to know whether a salesman beside him in a bar is a native or a visitor.
He asked him to ask a woman beside him whether she is a native or visitor. He replied, “She says she is a visitor.” Then he was immediately able to determine if the salesman is a native or a visitor. Is the salesman a native or a visitor?
Riddle Answer