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
A. 15 years
B. 15.5 years
C. 16 years
D. Cannot be computed

• d) cannot be computed
  
  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.
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