Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

What goes up but never comes down?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?

Using Only Five 5's and any mathematical operator make sum as 37

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?

Why are all black people so quick ?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

There is something which you can be arrested for attempting but not for successfully completing.

This was asked in an interview with Coa-Cola.

The interviewer has given me 100 marbles(50 white and 50 black) and two empty boxes.
He then told me that he will leave the room and i need to place all the marbles in two boxes.

And When he come back, he will draw a marble from any of the two box and if the marble is white I will be hired.

Also
* No box can be empty.
* All 100 marbles must be placed in one of the two boxes.

So what should I have done?