Question 60

The average age of 12 students is 14 years. If the age of the teacher is also included, the average becomes 15 years. What is the age of the teacher?

Solution

Given that average age of 12 students 14 years

$$\frac{sum\ of\ age\ of\ 12\ students}{12}$$=14

sum of age of 12 students=12$$\times\ $$14=168

after including teachers age the average became 15years

let the age of teacher be x

so,$$\frac{\left(x+168\right)}{13}$$=15

x+168=195

x=195-168

=>x=27

hence answer is option C

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