What is the next number in this matchsticks series riddle?

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

What does this Rebus Picture mean?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

Prove that twice of ten is the same as twice of eleven.

How can you make a TV, a bed, a dog, and a car liquid?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Which is Odd One Out and why?

4377

3954

9862

8454

9831

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?