SSC GD Constable previous year question
The average age of 39 students of a class is 39 years. If the age of the teacher is also included, the average age of the whole group becomes 40 years. The age (in years) of the teacher is:
Asked in SSC GD Constable 2025: 05 Feb 2025 Shift 3 · Quantitative Aptitude
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Correct answer: (C) 79
Total age of 39 students = 39×39 = 1521; total for 40 people = 40×40 = 1600; teacher's age = 1600−1521 = 79.
हिंदी में प्रश्न
एक कक्षा के 39 विद्यार्थियों की औसत आयु 39 वर्ष है। यदि शिक्षक की आयु भी शामिल कर ली जाए, तो पूरे समूह की औसत आयु 40 वर्ष हो जाती है। शिक्षक की आयु (वर्षों में) है:
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सही उत्तर: (C) 79
39 विद्यार्थियों की कुल आयु = 39×39 = 1521; 40 लोगों का कुल = 40×40 = 1600; शिक्षक की आयु = 1600−1521 = 79।
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