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

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

I am an odd number. Take away a letter and I become even. What number am I?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Name a key which is hardest to turn.

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?