When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Find out the missing number in the picture attached:

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

A Club organizes a Running Race, and John, Jacob, Minda, and Tony participated.

The results are as follows

John beats Jacob
Minda beats Toni
Toni beats John

Who came first in the race?

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

How Come ??

I travel all around the world but always stay in the corner. What am I?

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

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Find the missing letter in the last circle logically in the given below picture.