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How many students are there in the class? I. There are 20 boys in the class.
II. The number of girls is half the number of boys.

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

Step-by-Step Solution

Statement I gives 20 boys but no girls; statement II gives only a ratio. Together, girls = 10 and total = 30.
Answer: B) Both statements together are needed (neither alone is sufficient)

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