What does the below image rebus riddle means ?

Who are the happiest people in IPL match?

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?

Prove that the below maths equation is true.

8 + 8 = 91

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

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

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

How Come ??

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?