## 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?

Here it is calculated:

Let the sum of ages of 39 students be X

Then X/39= 15 years

15 years = 180 months

Now X = 39*180=7020

When the age of the teacher is included avg increases by 3 months. Let the sum ages of 39 students and one teacher be Y

Then Y/40= 183

Y= 183*40=7320

Teachers age= Y-X = 7320–7020= 300 months that is 25 years

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