1.

What is the average age of children in the class ? A. Age of the teacher is as many years as the number of children. B. Average age increased by 2 year, if the teachers age is also included.

Answer»

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

Solution :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.


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