What is the average age of children in the class ?
(i) Age of the teacher is as many years as the number of children.
(ii) Average age increased by 2 year if the teacher's age is also included.

Options

A. if the data instatement A alone is sufficient to answer the question.
B. if the data in statement B alone is sufficient to answer the question.
C. if the data either in statement A alone or instatement B alone is suffieient to answer the question
D. if the data given in both statements A and B together are not sufficient to answer the question.

Answer

D

Explanation

Let the number of children by x `" "…(i)`
From statement A we get, techer's age =x
From statement B we get, Average age of `(x+1)` persons `=(x+2)`
`therefore"Techer's age"=(x+2)(x+1)=x^(2)`
`=x^(2)+3x+2-x^(2)=3x+2" "...(ii)`
From (i) and (ii) also we cannot find the average age of the children.