What is the Surname of Barbie Doll?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

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

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Count the Triangle in the figure given below:

Solve the rebus riddle in the picture below.

What English word has three consecutive double letters?

I am a word of 12 alphabets.

* Alphabets 12, 4, 7, 2, 5 : Eastern beast of burden
* Alphabets 1, 8, 10, 9 are street made famous by Sinclair Lewis.
* Alphabets 11, 3, 6 are past.

On whole it means a person suffering from delusions of greatness.

What Is it ?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

The Puzzle: Here is a famous prize problem that Sam Loyd issued in 1882, offering $1000 as a prize for the best answer showing how to arrange the seven figures and the eight 'dots' .4.5.6.7.8.9.0. which would add up to 82