Pradeep is 4 years older than his wife Pratibha and the present age of their son is 9 years. If the present age of Pradeep's son is (\frac{1}{4}) times of Pradeep's age and if the couple's son was born after 2 years of their marriage, then find the age of Pradeep's wife at the time of her marriage.

Given: Pradeep is 4 years older than Pratibha, their son is 9 years old, and son's age = 1/4 of Pradeep's age. Let Pradeep's age = 4x, then son's age = x = 9, so Pradeep = 36 years. Pratibha = 36 - 4 = 32 years. Son was born 2 years after marriage, so at childbirth Pratibha was 32 - 9 = 23 years old. Therefore at marriage, Pratibha was 23 - 2 = 21 years.