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

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

Can you count the number of quadrilaterals in the picture below?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

John was piloting a plane behind a car but was never able to overtake it. Why?

How can you take 2 from 5 and leave 4?