SBI Clerk Prelims previous year question
Present age of A and B are a and (a+4). 4 years ago ratio A:B=6:7. C's age=B's age+10. x years ago, B:C=3:4. Average present age of A,B,C,D=40. Find D's age 4x years ago.
Asked in SBI Clerk Mains (12 Apr 2025) · Quantitative Aptitude
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Correct answer: (C) 50
7(a-4)=6(a+4-4)... solving with the ratio and dependent chain gives D's age 4x years ago = 50 (per official key derivation from the full system).
हिंदी में प्रश्न
A और B की वर्तमान आयु क्रमशः a और (a+4) वर्ष है। 4 वर्ष पहले A:B=6:7 था। C की आयु B से 10 वर्ष अधिक है। x वर्ष पहले B:C=3:4 था। A,B,C,D की औसत आयु 40 वर्ष है। 4x वर्ष पहले D की आयु ज्ञात कीजिए।
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सही उत्तर: (C) 50
कुंजी अनुसार पूर्ण समीकरण हल करने पर उत्तर=50।
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