In each of the following questions, a question is followed by two statements. Read both the statements and find which statements are required to answer the question and answer accordingly. What is the present age of a father? Statement I: The ratio of the present age of the father to that of his son is 5:2. Statement II: The difference between the present age of the father and his son is 30 years, and the sum of their present ages is 70 years.

From Statement I, let the present age of the father be 5x years and that of his son be 2x years. Since we do not have any absolute value or another relation, we cannot determine the value of x. So, Statement I alone is not sufficient to answer the question. From Statement II, let the present age of the father be F years and that of his son be S years. ATQ, F - S = 30 And, F + S = 70 Adding both equations, we get: Or, 2F = 100 So, F = 50 So, the present age of the father is 50 years. Thus, Statement II alone is sufficient to answer the question. Hence, the correct answer is B.