Below comes a solution of variation on problem about red and blue socks new twist on red and blue socks
The answer is four.

Two American Indians were sitting on a log - a big Indian and a little Indian. The litde Indian was the son of the big Indian, but thebig Indian was not the father of the little Indian.
How do you explain that?

Two men were being tried for a murder. The jury found one of them guilty and the other one not guilty. The judge turned to the guilty one and said: ‘This is the strangest case I have ever come across! Though your guilt has been established beyond any reasonable doubts, the law compels me to [...]

This story concerns a caravan going through the Sahara desert. One night they pitched tents. Our three principal characters are A, B, and C. A hated C and decided to murder him by putting poison in the water of his canteen (this would be C’s only water supply). Quite independently of this, B also decided [...]

Here is a well-known logic puzzle: Given that there are more inhabitants of New York City than there are hairs on the head of any inhabitant, and that no inhabitant is totally bald, does it necessarily follow that there must be at least two inhabitants with exactly the same number of hairs?
Here is a little [...]

A new twist on the above problem: Suppose some blue socks and the same number of red socks are in a drawer. Suppose it turns out that the minimum number of socks I must pick in order to be sure of getting at least one pair of the same colour is the same as the [...]

The following is a very simple problem which many of you know. Twenty-four red socks and 24 blue socks are lying in a drawer in a dark room. What is the minimum number of socks I must take out of the drawer which will guarantee that I have at least two socks of the same [...]

Here comes th solution for Whose picture is the man looking at v.2.
The answer to this problem, ‘ Brothers and sisters have I none, but this man’s son is my father’s son,’ is that the man is looking at a picture of his father.

This is a solution for problem What Happens if an Irresistible Cannonball Hits an Immovable Post?
The given conditions of the problem are logically contradictory. It is logically impossible that there can exist both an irresistible cannonball and an immovable post. If an irresistible cannonball should exist, then by definition it would knock over any post [...]

This is another problem from my childhood which I like very much. By an irresistible cannonball we shall mean a cannonball which knocks over everything in its way. By an immovable post we shall mean a post which cannot be knocked over by anything. So what happens if an irresistible cannonball hits an immovable post?
Before [...]