What number should come in place of the question mark below?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?