Let the age of son be x years five years ago.
∴ Mother’s age be x^{2} years five years ago.
After ten years son’s age be (x + 15) years and woman’s age be (x^{2} + 15)
Given x^{2} + 15 = 2(x + 15)
x^{2} + 15 = 2x + 30
x^{2} – 2x – 15 = 0
(x – 5)(x + 3) = 0
x = 5
Or x = - 3 (not possible)
∴ Son’s age five years ago = 5 years
Woman’ present age = 25 + 5
= 30 years.