In 2073 BS father's age was 7 times his daughter devyani's age. In 2081 BS father's age will be 3 times only his daughter's age. Find the birth date year of Devyani?

2069.

Step-by-step explanation:

Let Devyani's age in 2073 = x years and y be her fathers age Then:

y = 7x

- and in 8 years time (2081) we have:

y + 8 = 3 (x + 8)

y = 3x + 24 - 8

y = 3x + 16. Eliminating y from the 2 equations:

7x = 3x + 16

4x = 16

x = 4.

So in 2073 she was 4 years old

Therefore she was born in 2069.