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What is the two-digit number? Statement I: Its tens digit is twice its units digit. Statement II: The sum of its digits is 12. Which statement(s) is/are sufficient?

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

Step-by-Step Solution

I allows 21, 42, 63 or 84; II allows many numbers (39, 48, 57, …). Together , so and the number is 84.
Answer: C) Both statements together are needed (neither alone is sufficient)

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