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Question: What is the two-digit number? Statement I: The sum of its two digits is 9. Statement II: The tens digit is twice the units digit. Which statement(s) is/are sufficient to answer the question?

Competition practiceData Sufficiency
  • AStatement I alone is sufficient but Statement II alone is not
  • BBoth statements together are needed (neither alone is sufficient)
  • CStatement II alone is sufficient but Statement I alone is not
  • DEither statement alone is sufficient

Step-by-Step Solution

Each statement alone allows several numbers. Together: tens = 2 units and tens + units = 9 give units = 3, tens = 6, so the number is 63.
Answer: B) Both statements together are needed (neither alone is sufficient)

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