How can you write nineteen in a manner that if we take out one, it becomes twenty?

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

A father is locked up in jail. His wife has gone bankrupt. Their male child has to sell his hotel in order to gain some money. Yet their girl child does not care and is quite happy.

How can someone be so rude?

What will you call your mother's brother's brother-in-law?

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?

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

If it took eight men ten hours to build a wall, how long would it take four men to build it?