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Option 3 : 23 years
Given:
Ena born after the parent's marriage = 4 years
Age of father - Age of mother = 3 years
Age of mother - Age of Ena = 24 years
The present age of Ena = 13 years
Calculation:
According to the question, we have
Age of mother - Age of Ena = 24 years
⇒ Age of mother - 13 = 24
⇒ Age of mother = 24 + 13
⇒ Age of mother = 37 years
Now, according to the question
Age of father - Age of mother = 3 years
⇒ Age of father - 37 = 3
⇒ Age of father = 3 + 37
⇒ Age of father = 40 years
Now,
The age of Ena's father at the time of marriage = 40 - (13 + 4)
⇒ 40 - 17
⇒ 23 years
∴ The age of Ena's father at the time of marriage is 23 years.
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