The avearage age of boys in a class is 16 years and that of the girls is 15 years. The average age for the whole class is	Answers:
A) 15 years
B) 15.5 years
C) 16 years
D) Cannot be computed
E) None of these
Solution   Clearly, to find the average,we ought to know the numbers of boys , girls or students in the class, neither of which has been given.   so the data provided is inadequate.   Answer Cannot be computed
<result>D</result>
The avearage age of boys in a class is 16 years and that of the girls is 15 years. The average age for the whole class is