Correct Answer - Option 2 : 15 years
Let the age of daughter be x then,
Age of mother = 4x and,
Age of father = 5x
According to question,
Age of Father + Age of mother = 135
5x +4x = 135
9x = 135
x = 135/9
x = 15
So, Age of daughter = x = 15 years.
Hence, option 2 is the correct answer.