In 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 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 Answer“Jean is my niece,” said Jack to his sister Jill. “She is not by niece,” said Jill. How is it possible?
Riddle AnswerI woke up one night and heard my clock strike “one.” I was too tired to turn on the light to see what time it was. As I lay there pondering, it occurred to me to speculate how long I would have to lie awake in order to be sure what was the exact time.
My clock strikes the hours and strikes “one” each half hour. I fell asleep before I solved the problem, but can you work out what is the longest time I would have to lie awake after hearing the strike “one,” to be sure of the time?
Riddle Answer