Neither, Apple sucks dick.
Oh, and it's 2. PEMDAS or BEDMAS (Order of operations).
48÷2(9+3)
You do what's in the brackets first, which = 12.
You then have to deal with the brackets by distributing to them, which is 2x12 which = 24.
The last step is to take care of that division, which is 48 divided by 24, which = 2. So the answer is 2.