What is next number in the pattern below:

131 517 192 123 ?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

What does does this rebus picture means ?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Can you make a six-letter word using the letters N, A and B ?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?