Famous Chemist Murder Mystery

Detective Riddles

To attend a world science seminar, A famous chemist from Russia visit Tokyo(Japan). 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, Oscar, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

The detective Mehul was called to solve the case, After reading the note, Detective Mehul instantly asked the police to arrest the murderers. Who are the murderers?

Wayne and Dege
Lingard and Rojo
Austin and Oscar
Wayne and Oscar

Explanation :  Oscar and Austin.
Explanation:
The Chemist hide the name using periodic table as shown in below picture
76-20-44 => Os(76) + Ca(20) + Ru(44)
79-16-22-7=> Au(79) + S(16) + Ti(22) + N(7)