The answer is simple. As westfw said, if it was algebra, the question would not have the divide sign. If it was non-algebra, it would be 48÷2*(9+3) = ? or

48÷2*9+3 = ? That means the fault lies in the question, not in how you work it out.

On the assumption that it is non-algebra, you do the multiplacation and division, then the addition and subtraction. That would make it:

48÷2*9+3 = ?

48÷2=24 * 9 = 216 +3 = 219. Not 2, and not 288.

On the assumption that it is algebra, and working with the rule that implied multiplacation has a higher presedence than defined multiplacation,

the answer is:

2*(9+3) = 2*(12) = 24

48 ÷ 24 = 2

On the assumption that it is algebra, and implied multiplacation has the same presedence as defined multiplacation, the answer could either be:

2*(9+3)

=2*(12) = 24

48 ÷ 24 = 2

or

(9+3) = 12

48 ÷ 2 = 12

12 * 12 = 144

or

288

It all depends on what rules you apply.

(I must be doing something wrong as I have got 219 and 144, which were not mentioned, but not 288, which was...)

Onions.