# Boris and Natasha

1,443.3K Views

Boris and Natasha live in different cities in a country with a corrupt postal service.  Every box sent by mail is opened by the postal service, the contents stolen, and the box never delivered. Except: if the box is locked, then the postal service won’t bother trying to open it (since there are so many other boxes whose contents are so much easier to steal) and the box is delivered unharmed.

Boris and Natasha each has a large supply of boxes of different sizes, each capable of being locked by padlocks.  Also, Boris and Natasha each has a large supply of padlocks with matching keys.  The padlocks have unique keys.  Finally, Boris has a ring that he would like to send to Natasha.  How can Boris send the ring to Natasha so that she can wear it (without either of them destroying any locks or boxes)?

ronret45 Expert Asked on 1st August 2015 in

Boris puts the ring in a box and locks it with one of his padlocks, and sends the box to Natasha. Natasha attaches one of her padlocks (so now the box is locked with two locks) and sends the box back to Boris. Boris removes his padlock and sends the box back to Natasha. Natasha removes her padlock, opens the box, and removes the ring.

### Attack

Of course the corrupt postman will withhold the box Boris sent, add one of his (the postman’s) own padlocks, send it back to Boris, who will unlock his padlock so that the postman can open the box with his key.

satyen Guru Answered on 7th August 2015.

• ## More puzzles to try-

• ### Where is Thomas going wrong?

Thomas has missed an excessive number of days of school, so he must meet with Principal Davis. Mr. Davis asks ...Read More »
• ### Equate The Math

Find the mistake in the below maths equations A = 2 A(A-1) = 2(A-1) A2-A = 2A-2 A2-2A = A-2 ...Read More »
• ### A man with a car riddle

A man with a car on his head is called…….Read More »
• ### Club membership password puzzle

A man wanted to enter a club, Every member knows the password,  1 man hides himself beside a wall and ...Read More »
• ### Its Tasty but What is it?

There was a green house. Inside the green house there was a white house. Inside the white house there was ...Read More »
• ### No. of letters are in the alphabet

How many letters are in the alphabet ?Read More »
• ### Ants Tales Puzzle

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, ...Read More »
• ### Facing forward and bachward

A man goes to work at the same time each day and travels part of his journey facing forwards and ...Read More »
• ### More Money Riddle

John had 100k, Jacob has 10k and Johar will have 200k. Who has the most amount of money?Read More »
• ### What song did he sing?

A man is sitting in a pub feeling rather poor. He sees the man next to him pull a wad ...Read More »
• ### Square Root 12345678987654321

The square root of number 121 is “11”. What is the square root of the number “12345678987654321.”?Read More »
• ### One means None

If you have three you have three, if you have two you have two and if you have one you ...Read More »
• ### Lemonade and coke mixture riddle

There are two glasses in front of you. One of the glasses is full of coke and the other glass ...Read More »
• ### Water of life

It is the water of life, but seeing too much of it is never good. It is what binds families ...Read More »
• ### Love the Rebus Puzzle

What does the below mathematical rebus mean?Read More »
• ### Next Number in Series

Find the next number in the series below 21 32 54 87 131 ?Read More »
• ### Srabon wanted to pass

The result of math class test came out. Fariha’s mark was an even number. Srabon got a prime!! Nabila got ...Read More »
• ### Find the 8

Find the 8 in the below-given Image.Read More »
• ### Whats wrong in this picture puzzle

Whats wrong in this picture puzzleRead More »
• ### Train Passes the Tunnel

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it ...Read More »