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What is the present age of the son? Statement I: The father is 30 years older than the son. Statement II: In 10 years, the father's age will be twice the son's age. Which statement(s) is/are sufficient?

Competition practiceData Sufficiency
  • AStatement I alone is sufficient but Statement II alone is not
  • BEither statement alone is sufficient
  • CBoth statements together are needed (neither alone is sufficient)
  • DStatement II alone is sufficient but Statement I alone is not

Step-by-Step Solution

From I, f = s + 30; from II, f + 10 = 2(s + 10). Solving together gives s = 20, but each alone leaves two unknowns.
Answer: C) Both statements together are needed (neither alone is sufficient)

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