the average age of 9children and 1teacher is 8years2monthsof if the average age of 9 children is 6years2months,find the age of the teacher
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Step-by-step explanation:
The total number of students is S.
The average age is 9, means the total of all student’s age is 9S.
The number of person increases here is 1(i.e., teacher).
The average age is 10, means the total of everyone's age is 10(S + 1).
So, the teacher’s age = 10(S + 1) - 9S.
The age of the teacher is 10 + S.
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