I have teeth but i don't bite. Who Am I ?

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

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

What country can make you shiver?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.

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

What is the next number in the series?

15 29 56 108 208 ?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?