Suppose you want to send in the mail a valuable object to a friend. You have a box that is large enough to contain the object and the box can be fitted with multiple locks.
Both of you also have several locks and their corresponding keys. However, your friend does not have the keys to any of your locks. If you send a key in an unlocked box, there is a danger of theft.
How can you send the object securely to your friend?
Riddle AnswerYou have three stoves: a gas stove, a wood stove, and a coal stove, but only one match. Which should you light first?
Riddle AnswerYou must cut a birthday cake into eight equal pieces, but you’re only allowed to make three straight cuts, and you can’t move pieces of the cake as you cut. How can you do it?
Riddle AnswerA scientist puts a bacteria in a petri dish at exactly noon.
Every minute the bacteria divides into two and doubles in size. At exactly 1 PM the petri dish is full.
At what time was the dish half full?
Riddle Answer