Suppose there are twin brothers, one which always tells the truth and one which always lies. (So in this case they both know what is true and false, or as you put it, both are accurate in their knowledge.) What one yes-no question could you ask to either one of the brothers to figure out which one he is?
Riddle AnswerHard Riddles
Avoiding the Train
A man was walking along a railway track when he spotted an express train speeding towards him. To avoid it, he jumped off the track, but before he jumped he ran ten feet towards the train. Why?
Riddle Answer27 Balls
Given 27 table tennis balls, one is heavier than the others.
What is the minimum number of weighings (using a two-pan balance scale) needed to guarantee identifying the heavy one? The other 26 balls weigh the same.
Riddle AnswerTwo Hours Ago
If two hours ago it was as long after one o’clock in the afternoon as it was before one o’clock in the morning, what time is it right now?
Riddle AnswerMagic Grass
At a garden shop they’re selling Magic Grass, a patch of sod that doubles in size every day. A man goes to buy some and figures that his garden is big enough that if he buys one patch, it will cover his garden in 14 days, because each day it doubles in size. So he decides to speed up the process, and buys two patches of sods.
How many days will it now take for the Magic Grass to cover his garden?
Riddle Answer