DRDO Multi tasking staff Model paper 10

Given, X’s income = Rs. 18000
But, X’s income ∶ Y’s income = 3 ∶ 4
⇒ 18000/Y’s income = 3/4
⇒ Y’s income = 18000 × 4/3 = Rs. 24000
Now, X’s savings = Rs. 3000
∵ Expenses = Income - Savings
⇒ X’s expenses = 18000 - 3000 = Rs. 15000
But, X’s expenses ∶ Y’s expenses = 5 ∶ 5
⇒ 15000/Y’s expenses = 1
⇒ Y’s expenses = Rs. 15000
∴ Y’s savings = 24000 - 15000 = Rs. 9000