RRB JE practice question
In a school of 50 students, the combined average score in an exam is 68 marks. Among them, 20 students (Group 1) have an average score of 50 marks. Find the average score of the remaining 30 students (Group 2).
From a RRB JE Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (A) 80 marks
Total sum for all 50 students = 50 × 68 = 3400. Sum for the known group of 20 students = 20 × 50 = 1000. Sum for the remaining 30 students = 3400 − 1000 = 2400. Required average = 2400 ÷ 30 = 80 marks.
हिंदी में प्रश्न
एक स्कूल के 50 विद्यार्थियों का एक परीक्षा में संयुक्त औसत अंक 68 है। इनमें से, 20 विद्यार्थियों (समूह 1) का औसत अंक 50 है। शेष 30 विद्यार्थियों (समूह 2) का औसत अंक ज्ञात कीजिए।
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सही उत्तर: (A) 80 अंक
सभी 50 विद्यार्थियों का कुल योग = 50 × 68 = 3400. ज्ञात समूह के 20 विद्यार्थियों का योग = 20 × 50 = 1000. शेष 30 विद्यार्थियों का योग = 3400 − 1000 = 2400. अभीष्ट औसत = 2400 ÷ 30 = 80 अंक.
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