If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

In an office's desk, you find a unique method that shows the current day of the month. Two numbered cubes are used to depict the current date.

Can you find out the numbers on both the cubes so that each date can be mentioned using them?

Please note that you have to use both the cubes to display any date. Thus the 1st day must be represented by 01 and so on.

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

How many times can you subtract the number 5 from 25?

Which tank will fill first?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

What has to be broken before you can use it?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?