1.

1). 30 years2). 26 years3). 35 years4). 25 years

Answer»

Average age of 40 PERSONS including TEACHER = 16 YEARS 3 months

$(\Rightarrow 16 + \frac{3}{{12}} = 16 + \frac{1}{4} = \frac{{65}}{4}{\rm{\;years}})$

We know,

$(Average = \frac{{Sum\;of\;all\;observations}}{{Number\;of\;observations}})$

Sum of all observations = Average × Number of observations

Total age of 39 STUDENTS = 39 × 16 = 624 years

Also,

Total age of 40 persons = (65/4) × 40 = 650 years

∴ Age of the teacher = 650 years – 624 years = 26 years



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