Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different from the rest.

320 : 480

The logic is

(Second number ÷ 10) × 4 = Ist number

28 : 70 - (70 ÷ 10) × 4 = 28

320 : 480 - (480 ÷ 10) × 4 = 192 but 320 is given which is odd

120 : 300 - (300 ÷ 10) × 4 = 120

16 : 40 -(40 ÷ 10) × 4 = 16