Entry no. 6

16. If you put a coin in an empty bottle and insert a cork into the neck of the bottle, how could you remove the coin without taking the cork out or breaking the bottle?

17. You must cut a circular birthday cake into exactly eight equal pieces, but you're only allowed to make three straight cuts, and you can't move pieces of the cake. How can you do it?

18. Two fifty foot ropes are suspended from a forty foot ceiling twenty feet apart. You have only a knife. How much of the rope can you steal?

Good Luck!
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ANSWERS:
10. A towel.
11. 2, of course. That was easy, wasn't it?
12. Every of friends would have to travel 18 miles. With the velocity of 6 miles per hour it will take them 3 hours. Pidgeon would fly for 3 hours as well, with its velocity of 18 mph, so- 54 miles.