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When Rony was born the ratio of ages of his Father and grandfather is 7 : 15. After 4 years of Rony's birth the ratio of Rony and Rony's grandfather is 1 : 16. Then find the ratio of ages of Rony's father and mother when Rony was born if Rony's mother was 22 year old at the time of Rony's birth.

When Rony was born the ratio of ages of his Father and grandfather is 7 : 15. After 4 years of Rony's birth the ratio of Rony and Rony's grandfather is 1 : 16. Then find the ratio of ages of Rony's father and mother when Rony was born if Rony's mother was 22 year old at the time of Rony's birth. Correct Answer 14 : 11

Given:

The ratio of ages of Rony's father to Rony's grandfather when Rony was born = 7 : 15

The ratio of ages of Rony and Rony's grandfather when Rony was 4 years old = 1 : 16

Calculation:

Age of Rony's grandfather when Rony is 4 year old = 16 × 4

⇒ 64 years

Age of Rony's grandfather when Rony was born = 64 - 4

⇒ 60 years

Age of Rony's father at the time of Rony's birth = (60/15) × 7

⇒ 4 × 7

⇒ 28 years

Then ratio of ages of Rony's Father and Mother at the time of Rony's birth = 28 : 22

∴ 14 : 11

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