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

which number am I?

I look at you, you look at me I raise my right, you raise your left. What am I?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

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?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

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 ?