81.
Sachin is younger than Rahul by 7 years. If their ages are in the respective ratio of 7 : 9, how old is Sachin?
Answer: C
Let Rahul's age be \(x \) years .
Then, Sachin's age = \((x-7)\) years
\(\therefore \) \(\frac{x - 7}{x}=\frac{7}{9}\)
\(\Rightarrow 9x - 63 = 7x\)
\(\Rightarrow 2x = 63\)
\(\Rightarrow x = 31.5\)
Hence, Sachin's age = \((x-7)\) = 24.5 years
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