SSC CHSL Tier-1 previous year question
Average of 11 numbers is 50. First six average 49, last six average 52. Find the middle (6th) number.
Asked in SSC CHSL Tier-1 (14 Nov 2025 Shift 3) · Quantitative Aptitude
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Correct answer: (B) 56
Total=11×50=550. First6 total=294, last6 total=312. Sum=606, but the 6th number is counted in both groups, so overlap=606−550=56.
हिंदी में प्रश्न
11 संख्याओं का औसत 50 है। प्रथम छः का औसत 49 है, अंतिम छः का औसत 52 है। मध्य (6वीं) संख्या ज्ञात कीजिए।
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उत्तर और व्याख्या देखें
सही उत्तर: (B) 56
कु ल=550। प्रथम6 का कु ल=294, अंतिम6 का कु ल=312। योग=606, चूँकि छठी संख्या दोनों में गिनी गई है: अतिव्याप्ति = 606−550=56.
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