Answer:
4
Step-by-step explanation: PEMDAS
Parenthesis first: (Left to right)
24 ÷ [ ( 16 ÷ 2 ) - ( 4 ÷ 2 ) ]
24 ÷ [ ( 8 ) - ( 4 ÷ 2 ) ]
People think "no exponents or multiplication, so division!" But, no. The brackets are also considered parenthesis. So you have to to 8 - 2 first.
24 ÷ [ ( 8 ) - ( 2 ) ]
24 ÷ [ ( 6 ) ]
At this point, you can get rid of the parenthesis and brackets because there is only one number in it.
24 ÷ 6
= 4
