Question : The salaries of Rida and Riya are in the ratio of 3 : 5, respectively. If the salary of each one is increased by Rs. 5,000, then the new ratio becomes 5 : 7. What is Riya’s present salary?
Option 1: Rs. 12,500
Option 2: Rs. 7,500
Option 3: Rs. 2,500
Option 4: Rs. 10,000
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Correct Answer: Rs. 12,500
Solution : Let the present salaries of Rida and Riya be $3x$ and $5x$ respectively. According to the question, $(3x + 5000) : (5x + 5000) = 5 : 7$ ⇒ $21x + 35000 = 25x + 25000$ ⇒ $4x = 10000$ ⇒ $x = 2500$ $\therefore$ Salary of Riya = $5x$ = 12500 Hence, the correct answer is Rs. 12500.
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