The total of the present ages of A, B, C and D is 96 years. What is B’s present age?

I. The average age of A, B and D is 20 years.
II. The average age of C and D is 25 years.

Options
- if the data in statement I is sufficient and II is not required;
- if the data in statement II is sufficient and I is not required;
- if the data in both statements is necessary;
- if the data in both statements is not sufficient to answer the question

CORRECT ANSWER : if the data in both statements is not sufficient to answer the question

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