Question : The monthly incomes of Ravi and Shiv are in the ratio 1 : 2 and their monthly expenditures are in the ratio 1 : 3. If each saves INR 4,000 per month, then find the monthly income of Shiv.
Option 1: INR 16,000
Option 2: INR 18,000
Option 3: INR 14,000
Option 4: INR 20,000
Correct Answer: INR 16,000
Solution : Let the monthly income of Ravi and Shiv be $x$ and $2x$. According to the question, $\frac{x-4000}{2x-4000}=\frac{1}{3}$ ⇒ $3x-12000=2x-4000$ ⇒ $x=8000$ Thus, the monthly income of Shiv = $2x=2\times8000=16000$ Hence, the correct answer is INR 16,000.
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