Can it be possible to build a house that has all its four walls facing towards the South?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

I have an apple tree , number of apple in this tree get doubles every week.

On 30th week , the tree gets completely filled with apples :-)



Can you tell me , on what week does my tree is half covered with apples ?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

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

I have branches, but no fruit, trunk or leaves. What am I?

Can you find out the remainder when 3^300 is divided by 5?