7. Father was 28 years old when I was born.the sum of our ages is 84. How old I am?
Let x represent your age.
Since your father was 28 years old when you were born, his age when you were born is equivalent to the age difference between you and him:
x - 28
The sum of your ages is 84, so we can set up the equation:
x + (x - 28) = 84
2x - 28 = 84
2x = 112
x = 56
Therefore, you are 56 years old.