What is the Surname of Barbie Doll?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

I can write cow in 13 letters.

Can You?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

Give it food and it will live; give it water and it will die.

What jumps when it walks and sits when it stands?