Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Can you replace the question mark with the correct number in the below table sequence?

Can you move 2 matchsticks to form four equal sized squares.

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?

What makes this number unique: 8,549,176,320?

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

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

What word does this rebus represent?

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