What is the Surname of Barbie Doll?

Decode this picture on T-Shirt and tell what it says ?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

You can see three almost identical images below. Can you spot the odd one out from them?

Spot 5 differences in two Christmas tree below:

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

81 x 9 = 801. What must you do to make the this equation true?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

What time is it when an elephant sits on a fence?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?