I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

You have 1023 apples and 10 bags. You have to distribute these apples in these 10 bags in any way you choose. But when I ask for a certain number of apples you have to give them in terms of bags without transferring the apples from other bags. How do you distribute the apples?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

Which number should replace the question mark?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?