The mean age of 20 students is 15 years if the age of the teacher included ,then the mean age becomes 17 years find the age of the teacher
Answers
The age of the teacher is 57 years.
Explanation:
The mean age of 20 students is 15 years.
∴ Total age of 20 students = (15× 20) years
= 300 years.
The mean age of 20 students with the teacher is 17 years.
Hence, total number of people = (20+1)
= 21 people
∴ The total age of the students with the age of the teacher = (17×21) years
= 357 years
∴ The age of the teacher = (total age of the students with the teacher - total age of the students)
= (357-300) years
= 57 years.
∴ The age of the teacher is 57 years.
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Answer:
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