0 views
4 ratings
0 saves
Question: When Tommy was 10 years old his sister Suzy was half his age. Now that Tommy is 50 years old how old is his sister Suzy?
1k views
165 ratings
6 saves
Question: Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a sports car; behind all of the others is bicycles. You pick a door, say No. 1, and the host, who knows what's behind the doors, opens another door, say No. 2, revealing a bicycle. He then says to you, "Do you want to pick door No. 3?" Is it to your advantage to switch your choice?
97.3k views
106 ratings
2 saves
Question: How many people do you need to have the odds be in favor (at least 50% chance) of two people having the same birthday?
1k views
112 ratings
6 saves
Question: If you have an 11 minute and 13 minute hourglass, how can you accurately time 15 minutes?
3k views
259 ratings
16 saves
Question: You have a glass of water that looks about half full. How can you tell, only using the glass of water itself, if the glass is half full or not?
The glass is a right cylinder.
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