John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Jigsaw captured 100 people and make them stand in a circle and all these people are labelled as Person1, Person2, Person3... Person100. He made them play a crazy game in which Person 1 shot Person 2 and pass the gun to the next person and so on until one stands alive.

Which person will survive in the end?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Which tank will fill first?

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 ?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

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

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _