Question

The average age of a class of 39 students is 15 years .If the age of the teacher be included, then the average increases by 3 months .Find the age of the teacher.

Answer 1

Answer:

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Answer 2

Answer:

25years

Step-by-step explanation:

by using the average formula

1. total sum of the age is 39*15=585
2. total sum of the ages including teacher is 40*(15+3/12)=610
3. just by subtracting the values 610-585=25 years