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Question

Monthly incomes of Ajay and Arun are in the ratio 4:3, while their monthly expenditure are in the ratio 3:2. However, both save Rs. 1,200 per month. What is the sum of their monthly incomes?

अजय और अरुण की मासिक आय का अनुपात 4:3 है, जबकि उनके मासिक व्यय का अनुपात 3:2 है। हालांकि, दोनों प्रतिमाह 1,200 रु. की बचत करते हैं। उनकी मासिक आय का योगफल कितना है?

A
Rs 8,600
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B
Rs 6,000
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C
Rs 8,400
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D
Rs 7,000
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Solution

The correct option is C Rs 8,400
Let the incomes of Ajay and Arun be 4x and 3x respectively and let their expenses by 3y and 2y respectively.
Saving of Ajay and Arun is Rs. 1200.
According to the question:
4x – 3y = 1200 ….(i)
3x – 2y = 1200 ….(ii)
Multiplying (i) by 2 and (ii) by 3, we get:
8x – 6y = 2400
9x – 6y = 3600
Solving the above two equations, we get: x = 1200
Monthly income of Ajay = 4x = 4 × 1200 = Rs 4,800
Monthly income of Arun = 3x = 3 × 1200 = Rs 3,600
So, sum of their incomes = 4800 + 3600 = Rs 8,400
Hence, option (c) is the correct answer.

माना कि अजय और अरुण की आय क्रमशः 4x और 3x है और माना कि उनके व्यय क्रमशः 3y और 2y हैं।
अजय और अरुण की बचत 1200 रु. है।
प्रश्नानुसार:
4x – 3y = 1200 (i)
3x – 2y = 1200 (ii)
(i) का 2 से और (ii) का 3 से गुणा करने पर, हमें प्राप्त होता है:
8x – 6y = 2400
9x – 6y = 3600
उपर्युक्त दो समीकरणों को हल करने पर हमें प्राप्त होता है: x = 1200
अजय की मासिक आय = 4x = 4 × 1200 = 4,800 रु.
अरुण की मासिक आय 3x = 3 × 1200 = 3,600 रु.
इसलिए उनकी आय का योग = 4800 + 3600 = 8,400 रु.
इस प्रकार, विकल्प (c) सही उत्तर है।

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