only there is no '/' in the original problem and there are definitely NO parentheses around the 48 and 2. you are adding symbols to the problem to CREATE a grouping that is not expressly defined.
The symbols "÷" and "/" can be used interchangeably.
1÷2 = 1/2
Also if when you get to the Mult/Div level you do the operation from left to right so you do 48/2 (48÷2) first.