Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

What is the next number in this matchsticks series riddle?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

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?

What is the end of everything?

There is a place where if I stand up straight, I will still be considered sideways.

It is always ahead of me yet I can never see it. What is it?

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?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.