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More brain teasers
- I'm tall when I'm young and short when I'm old. What am I?
- What is grey, lives in water, and is very smart, often leaping near boats?
- A train leaves a station every hour on the hour heading east, and another heads west the same way. If a bird flies between them, does direction matter to when they meet?
- What can you draw without a pencil or pen?
- A snail at the bottom of a 5-meter wall climbs 2 meters by day and slips 1 meter at night. How many days to the top?
- A father's age is currently four times his son's. In 20 years it will be double. How old are they now?