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

If eleven plus two equals one, what does nine plus five equal?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

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

Find the next number in the series below.

6 18 270 72090 ?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H