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Unit 5 · Mathematical Reasoning and Aptitude Paper 1 · 12 October 2022 Morning

Kavita's age is eight years more than thrice the sum of the ages of her two grandsons who are twins. Nine years later, Kavita's age will be one year more than two times the sum of the ages of her two grandsons. What was the age of Kavita when her grandsons were born?कविता की आयु उसके दो जुड़वाँ पोतों की आयु के योग के तीन गुने से आठ वर्ष अधिक है। नौ वर्ष बाद, कविता की आयु उसके दोनों पोतों की आयु के योग के दो गुने से एक वर्ष अधिक होगी। जब उसके पोतों का जन्म हुआ था, तब कविता की आयु कितनी थी?

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Correct answer: A. 58 years58 वर्ष

Explanation

Let each twin's present age be t, so the sum of their ages = 2t. Then Kavita's age K = 3(2t) + 8 = 6t + 8. Nine years later the twins' ages sum to 2t + 18, so K + 9 = 2(2t + 18) + 1 = 4t + 37. Substituting: 6t + 8 + 9 = 4t + 37 → 2t = 20 → t = 10, giving K = 68. When the grandsons were born Kavita was 68 − 10 = 58 years.मान लीजिए प्रत्येक जुड़वाँ पोते की वर्तमान आयु t है, अतः उनकी आयु का योग = 2t। तब कविता की आयु K = 3(2t) + 8 = 6t + 8। नौ वर्ष बाद पोतों की आयु का योग = 2t + 18, अतः K + 9 = 2(2t + 18) + 1 = 4t + 37। प्रतिस्थापित करने पर: 6t + 8 + 9 = 4t + 37 → 2t = 20 → t = 10, अतः K = 68। पोतों के जन्म के समय कविता की आयु = 68 − 10 = 58 वर्ष।

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