You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

You see me once in June, twice in November, and not at all in May. What am I?

What is common among 11, 69, and 88?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

How could a baby fall out of a twenty-story building onto the ground and live?