What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

A Car driver was heading down a street in Washington. He went right past a stop sign without stopping, he turned left where there was a 'no left turn' sign and he went the wrong way on a one-way street. Then he went on the right side of the road past a cop car. Still, he didn't break any traffic laws. Why not?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?