The average age of 48 students of a class is 22 years.

The average age of 48 students of a class is 22 years. If the age of the teacher is also included, the average age of the whole group becomes 23 years. The age (in years) of the teacher is:
एक कक्षा के 48 विद्यार्थियों की औसत आयु 22 वर्ष है। यदि शिक्षक की आयु को भी सम्मिलित कर ली जाए, तो संपूर्ण समूह की औसत आयु 23 वर्ष हो जाती है।शिक्षक की आयु (वर्षों में) ज्ञात कीजिए?

60 71 68 70

Detailed Solution & Logic

Correct Answer:

71

Total age of 48 students = $ 48 \times 22 = 1056 $
Total age including teacher = $49 \times 23 = 1127 $
Teacher's age = 1127 - 1056 = 71
Answer = 71years

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