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