Looking at the relationship between the numbers in each pair:
Option 1: (140, 45)
140=45×3+5
Option 2: (110, 35)
110=35×3+5
Option 3: (100, 30)
100=30×3+10
Option 4: (80, 25)
80=25×3+5
In Options 1, 2, and 4, the first number equals the second number multiplied by 3, plus 5.
In Option 3, the first number equals the second number multiplied by 3, plus 10.
Therefore, Option 3 is different from the others.