why number 8549176320 is one of a kind?

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?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Solve the puzzle by telling what does below picture means.

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Which flower has two lips?

Find the number of squares in the below-given picture.

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Which English verb becomes past tense just by rearranging the letters?