Question : Four years ago, Shyam's age was $\frac{3}{4}$th times that of Ram. Four years hence, Shyam's age will be $\frac{5}{6}$th times that of Ram. What is the present age of Shyam?
Option 1: 24 years
Option 2: 20 years
Option 3: 16 years
Option 4: 15 years
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Correct Answer: 16 years
Solution : Given: Four years ago, Shyam's age was $\frac{3}{4}$th times that of Ram. Four years ago, assume the ages of Ram and Shyam were $4x$ and $3x$. Four years hence, Shyam's age will be $\frac{5}{6}$th times that of Ram. According to the question, $\frac{4x+8}{3x+8}=\frac{6}{5}$ ⇒ $20x+40=18x+48$ ⇒ $20x-18x=48-40$ ⇒ $2x=8$ ⇒ $x=4$ The present age of Shyam $=3x+4=3\times 4+4= 16$ years Hence, the correct answer is 16 years.
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