Face mask math puzzle with answer


What is the best and full answer to the following math puzzle? See answer & hint below.
created by sunlightSolver
  

 



Brain teaser - Number And Math Puzzle - Face mask math puzzle with answer - What is the best and full answer to the following math puzzle? See answer & hint below.




84 liked this
   
How many people solved this? 370 solved this


There can be more correct answers..

face mask = +4 (result 1)

face mask = -4 (result 2)