The average age of 30 students in a group is 18 years.
The average age of 30 students in a group is 18 years. When the teacher’s age is included, the average age of the group increases by 1 year. What is the teacher’s age (in years)?
एक समूह में 30 विद्यार्थियों की औसत आयु 18 वर्ष है। जब शिक्षक की आयु को आयु शामिल की जाती है, तो समूह की औसत आयु 1 वर्ष बढ़ जाती है। शिक्षक की आयु (वर्षों में) कितनी है?
Detailed Solution & Logic
Correct Answer:
49
Average age of 30 students= 18
Total age of 30 students = $ 30 \times 18 = 540 $
New average (students + teacher) = 18 + 1 = 19
Total persons = 31
Total age of 31 persons = $ 31 \times 19 = 589 $
Teacher's age = 589 - 540 = 49
Answer = 49 years
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