The average age of the boys in a class is 16 years and that of the girls is 15 years. The average age for the whole class is :

15
20
21
data inadequate

Correct Answer: data inadequate

Explanation:

Clearly, to find the average, we ought to know the number of boys, girls or students in the class, neither of which has been given.

So, the data provided is inadequate.

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