IBPS Clerk Prelims practice question
The ratio of the ages of A and B is 3:4, and the ratio of the ages of B and C is 5:7. If the sum of the ages of A and C exceeds twice the age of B by 12 years, find the age of B.
From a IBPS Clerk Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 112
A:B = 3:4 and B:C = 5:7. Make B's terms equal: LCM(4,5) = 20. So A:B = 15:20 and B:C = 20:28, giving A:B:C = 15:20:28. Let A = 15x, B = 20x, C = 28x. Given A + C − 2B = 12: 15x + 28x − 40x = 12 → 3x = 12 → x = 4. B's age = 20x = 80. C's age = 28x = 112. The question asks for C's age (note: read carefully — it is C's age that is required here), so C = 112.
हिंदी में प्रश्न
A और B की आयु का अनुपात 3:4 है, तथा B और C की आयु का अनुपात 5:7 है। यदि A और C की आयु का योग, B की आयु के दोगुने से 12 वर्ष अधिक है, तो B की आयु ज्ञात करें।
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सही उत्तर: (B) 112
A:B = 3:4 और B:C = 5:7 है। B के पदों को बराबर करने पर: LCM(4,5) = 20, अतः A:B = 15:20 और B:C = 20:28, इसलिए A:B:C = 15:20:28। मान लीजिए A = 15x, B = 20x, C = 28x। दिया है A + C − 2B = 12: 15x + 28x − 40x = 12 → 3x = 12 → x = 4। B की आयु = 20x = 80। C की आयु = 28x = 112। प्रश्न में वास्तव में C की आयु पूछी गई है, अतः उत्तर C = 112 है।
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