RRB NTPC CBT-1 previous year question
The average of five numbers is 24. If four of the numbers are 18, 20, 25 and 27, what is the fifth number?
Asked in RRB NTPC 2026 — 16 June Shift 3 · Quantitative Aptitude
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Correct answer: (B) 30
Total of five numbers = 24×5 = 120; sum of the four known numbers = 18+20+25+27 = 90; the fifth number = 120-90 = 30.
हिंदी में प्रश्न
पांच संख्याओं का औसत 24 है। यदि इनमें से चार संख्याएँ 18, 20, 25 और 27 हैं, तो पाँचवीं संख्या ज्ञात काजिए।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 32
पांच संख्याओं का कुल योग = 24×5 = 120; चार ज्ञात संख्याओं का योग = 18+20+25+27 = 90; पांचवीं संख्या = 120-90 = 30 है।
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