Which tank will fill first?

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?

If you say my name, I will no longer exist. What am I?

You need to remove two matchsticks to make the below equation true. Can you do it ?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What always comes into a house through the keyhole?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

In the picture given below, can you find out which digit will take place of the question mark?