If two's company, and three's a crowd, then whats four and five ?

What does below Rebus say?

XLR8

Can you replace the question mark with the correct number in the below table sequence?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?