The average age of a child in a class of 35 is 11. The average age, including the teacher is 12. How old is the teacher ?

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Solution

Average age of 35 chilgren = 11
Total age of 35 children = 35 x 11 = 385

Average age of 36 including the teacher = 12

Total age of 36 including the teacher = 36 x 12 =432

Age of the teacher = 432 - 385 = 47

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The average age of a child in a class of 35 is 11. The average age, including the teacher is 12. How old is the teacher ?

Average age of 35 chilgren = 11 Total age of 35 children = 35 x 11 = 385 Average age of 36 including the teacher = 12 Total age of 36 including the teacher = 36 x 12 =432 Age of the teacher = 432 - 385 = 47

Average age of 35 chilgren = 11
Total age of 35 children = 35 x 11 = 385

Average age of 36 including the teacher = 12

Total age of 36 including the teacher = 36 x 12 =432

Age of the teacher = 432 - 385 = 47