Which flower has two lips?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

If you say my name, I will no longer exist. What am I?

Can you divide the below-given shape into four equal and identical pieces?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

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

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?