What is the Surname of Barbie Doll?

Can you count the number of quadrilaterals in the picture below?

What four weights can be used to balance from 1 to 30 pounds?

Which is the smallest number that you can write using all the vowels exactly once?

What is wrong in the below Picture?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

What do you get if you add 2 to 100 four times?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?