Got it after the first two :P.
Not really riddles but more logic puzzles:
There is a coin inside an empty bottle, and the bottle has a cork in the neck. How do you get the coin out without removing the cork, or breaking the bottle?
A Petri dish hosts a healthy colony of bacteria. Once a minute every bacterium divides into two. The colony was founded by a single cell at noon. At exactly 12:43 (43 minutes later) the Petri dish was half full.
At what time will the dish be full?
Caroline is 15, John is 5, and Gertrude is 10. Using the same system, how old is Timothy?





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