The average age of a class of 30 students is 12 .if the teacher is also included the average becomes 13years.find the teachers age?
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Answer:43 years
Explanation:
No. Of students=30
Average of 30 students=12
Hence, 30x12=360
Now, teacher is included. So, the total strength becomes 31 and the average age is 19
31x19=403
Hence, 403-360=43 years.
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