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

What is next number in the pattern below:

131 517 192 123 ?

I make two people out of one. What am I?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What goes up but never comes down?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

I am sure no one can have two things for dinner. what are they?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?