Lubna is 15 years old and her father is 40. How many years ago was the father six times as old as Lubna?
Lubna is 15 years old and her father is 40. How many years ago was the father six times as old as Lubna?
Explanation
Let the present age is = x
Lubna age = x + 15
Father age = x + 40
x + 40 = 6(x+15)
x + 40 = 6x + 90
5x = 50
x = 10 years