GEMDAS: Grouping (Parenthesis), Exponents, Multiplicatio/Divison (left to right), Addition/Subtraction (left to right)
I will walk you through this problem:
(15 + 50 - 5) / 12
So, 15 plus 50 is 65. 5 subtracted from 65 is 60.
So now, your equation looks like this:
60/12
60 divided by 12 is 5, because 5 multiplied by 12 is 60.
So your answer is...??