# What is the average age of children in the class I. The age of the teacher is as many years as the number of children II. Average age is increased by 1 year if the teacher's age is also included

#### Comments and Answers (3)

**Rashmi** * *

how did the answer came

**Archana** * *

please anyone explain this answer

**Laxmi ** * ~ Mumbai*

Let there be x children.

I gives, age of teacher = x years.

II gives, average age of (x + 1) persons = (x + 1) years.

∴ Teacher's age =(x+1)(x+1)−x

2

=(x

2

+1+2x)−x

2

=(1+2x)

Thus, teacher's age cannot be obtained.

∴ Correct answer is (D)

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