I think everyone who says 288 is wrong, for 2 reasons.

1. This essentially the same as 48/2x (where x=12), in which case we would always multiply x and 2 first.

And

2. We always have the option of expanding the brackets, which would always be done as follows:

48÷2(9+3) =

48
2(9+3) =

48
2*9 +2*3 =

48 / 24 = 2