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

Which is the smallest number that you can write using all the vowels exactly once?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Find out the missing number in the picture attached:

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

An ant is travelling on a 1-meter-long rope at 1 cm/second but also the entire rope is being stretched by an extra 1 meter/second. Is it possible for the ant to reach at the end of the rope?

what's the probability of getting a king or a queen from a pack of 52 cards?

Why do Chinese men eat more rice than Japanese men do ?