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Riddle:
You have two ropes of uneven width that each take an hour to burn out (if you have trouble visualising this just know that 30 min won't be exactly in the middle, and 20 min won't be a third, etc.). How do you measure 45 min with these two ropes and fire?
Answer: You set fire to both ends of one rope but only one end of the other. When the first rope burns out it will have been 30min. When this happens, you set fire to the other side of the other rope. After that burns out, in 15min, it will have been 45min.
Riddle:
Helen went to a summer camp with her best friends. One day, the friends had to tell each other fun facts about themselves. Helen told her friends, "I was born on February 29th, so I have four times fewer birthdays than you guys. This year, I turned 17,". Helen's friends laughed at her and called her out for lying. Why?
Answer: February 29th only happens once every four years. Helen couldn't celebrate her 17th birthday on her actual birthday because this number can't be divided by four. So, either she wasn't born on February 29th, or she's not 17.
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: Send the box with a lock attached and locked. Your friend attaches his or her own lock and sends the box back to you. You remove your lock and send it back to your friend. Your friend may then remove the lock she or he put on and open the box.
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