What is the Surname of Barbie Doll?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

James ordered a fishing rod, priced at $3.56. Unfortunately, James is an Eskimo who lives in a very remote part of Greenland and the import rules forbid any package longer than 4 feet to be imported. The fishing rod was 4 feet and 1 inch, just a little too long, so how can the fishing rod be mailed to James without breaking the rules? Ideally James would like the fishing rod to arrive in one piece!

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.

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?