Necklace to Fiancee

Question: Mr. X wants to send Diamond Necklace to his fiancee Y who lives in some other country. Mr. X puts the Diamond Necklace inside a box to parcel. Note that:  1. The parcel must be locked.

2. The box is made up of such a material that nobody can break it.

3. The box has a handle large enough to put a lock on it.

4. Mr. X can not send a key with the parcel.

5. Combination locks and telephones are not available.

How will Mr. X send Diamond Necklace to his fiancee Y?

Answer:

Mr. X and his fiancee Y will follow the following steps.

1. Mr. X will put Diamond Necklace inside a box and will lock it.

2. He will send the parcel to his fiancee Y, without the key.

3. Y will put her lock on it and will send box back to Mr. X.

4. Mr. X will remove his lock and will send the box back to Y.

5. Y will remove her lock and will receive the Necklace.


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