Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

What is the end of everything?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

Can you make a six-letter word using the letters N, A and B ?

What always comes into a house through the keyhole?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?