If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Detective Rockford was jogging near the beach at 4:30 am.
He hears a sound near the shack "No Michael, Please Do not shoot me".
Next instance he heard the sound of gunfire. Rockford rushes to the shack where he finds women lying dead and a gun in close proximity of three "Doctore Lawyer and a Teacher".

Rockford immediately knew that the Lawyer has committed the crime. How?

Can you name some countries which do not have the alphabet 'A' in them?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?