Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

Imagine you are in a room with no windows or doors. How will you get out?

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?

When we see 2 but call 10?

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

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?