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

Rashmi

how did the answer came

Archana

Archana

please anyone explain this answer

Laxmi ~ Mumbai

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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