Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

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.

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

In the picture given below, can you find out which digit will take place of the question mark?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

Find the last number in the series below:

voN luJ yaM raM ---

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?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?