What is next number in the pattern below:

131 517 192 123 ?

What is both possible and impossible at the same time?

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 ?

Jigsaw captured 100 people and make them stand in a circle and all these people are labelled as Person1, Person2, Person3... Person100. He made them play a crazy game in which Person 1 shot Person 2 and pass the gun to the next person and so on until one stands alive.

Which person will survive in the end?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

What does an Island and the letter T have in common?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?