How can you make number one disappear by adding something to it?

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

Which five letter word can be added at the end of below word to form a
valid word?

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In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

If two's company, and three's a crowd, then whats four and five ?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?