28. A father is 7 yr older than mother and mother's age now is 3 times the age of daughter. Daughter is 10 yr old now. What was the father's age when daughter was born ? / एक पिता माँ से 7 वर्ष बड़ा है और माँ की आयु अब बेटी की आयु की 3 गुना है। बेटी अभी 10 साल की है। बेटी के जन्म के समय पिता की आयु क्या थी?
37 yr
27 yr
40 yr
15 yr
Answer / उत्तर -27 yr
explanation / स्पष्टीकरण :-
explanation / स्पष्टीकरण :-
∵ Mother’s age now is 3 times the age of the daughter.
∴ Age of mother = 3 × 10 years = 30 years.
Again, Father is 7 years older than the mother.
∴ Age of father = (30 + 7) years = 37 years.
∴ Age of father when daughter was born = Age of father 10 years ago
= 37 years – 10 years
= 27 years.
∴ The father's age when daughter was born is 27 years
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