How can you leave a room with two legs and return with six legs?

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

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

81 x 9 = 801. What must you do to make the this equation true?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

who is silent in the parliament?

What does below pictogram mean?