Lubna is 15 years old and her father is 40. How many years ago was the father six times as old as Lubna?
Answer: 10 years
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
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