Question

RIDDLE:
Suppose you want to send in the mail a valuable object to a friend. You have a box which is big enough to hold the object. The box has a locking ring which is large enough to have a lock attached and you have several locks with keys. However, your friend does not have the key to any lock that you have. You cannot send the key in an unlocked box since it may be stolen or copied. How do you send the valuable object, locked, to your friend - so it may be opened by your friend? 

Answer 1

It is not mentioned that the locks are put in that box with the valuable object.
So, I'll simply send him the box...

Answer 2

I will lock it with my lock and tell him that when the box reaches to him he will lock it with his lock and send me back again. There will be 2 locks 1 my and 1 of my friend. Then I will take my lock and send it again to him. Then he will unlock his lock from the box and he will get the object.
I hope it helps you.
Please make me brainliest.