What is the Surname of Barbie Doll?

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

Move three sticks of the spiral below to form a square.

Find out the missing number in the picture attached:

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 ?

You can hear me, but you can't touch or see me.

What am I?

Find the number of squares in the below picture

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?