What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Can you spot the hidden girl in the picture below?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

I have an eye but still cannot see.

Who am I?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?