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?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Why despite killing dozens of people Charley and Wilma were not punished?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

What does the below rebus puzzle mean?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

What's a single-digit number with no value?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).