Multiple choice

The average age of 40 students in a class is 15 years. If the age of teacher is also included, the average becomes 16 years. Find the age of teacher? किसी कक्षा में 40 विद्यार्थियों की औसत आयु 15 वर्ष है। यदि इसमें अध्यापक की आयु भी जोड़ दी जाये तो औसत आयु 16 वर्ष हो जाती है। अध्यापक की आयु ज्ञात करे?

  1. 56 years 56 वर्ष

  2. 15 years 15 वर्ष

  3. 17 years 17 वर्ष

  4. 34 years 34 वर्ष

  5. None of these इनमें से कोई नहीं
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A Correct answer
Explanation

Total age of 40 students = 40 × 15 = 600 years. When teacher is included, total persons = 41 and new average = 16, so total = 41 × 16 = 656 years. Teacher's age = 656 - 600 = 56 years. The teacher's age adds enough to increase the average by 1 year across all 41 people.

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