Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

What is the largest number you can write with just 3 digits?

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

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

Where do fish keep their money?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

A father's child, a mother's child, yet no one's son.

Who am I?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?