Given below is a question followed by two statements

Solution

Statement:  I. B is 15 years younger than A. This statement alone is not sufficient to determine B's age because it provides a relationship between the ages of A and B, but we need the actual age of A or B to find B's age. II. C is 40 years old. This statement alone is not sufficient either because knowing C's age does not provide any information about B's age or the relationship between A and B. Now, let's combine the statements: If we know that C is 40 years old (Statement II) and we also know the relationship between the ages of A and B (Statement I), we can find B's age. However, if we only know Statement I or Statement II alone, it is not sufficient to determine B's age. Therefore, the answer is both statements together (I and II) are required to answer the question.