spellbinder1005 wrote:
I agree that A is sufficient but if you combine A and B sentences and substitute y= 2x in 2x+5y=12, you get X=1 and Y=2 which is a more precise answer to A. Bcz they didn't mention if the number is rational or integer they just mentioned it is a positive number.
ScottTargetTestPrep Bunuel GMATNinjaFor data sufficiency, as long as a statement gives enough information to answer the question, it's sufficient.
As you say, statement 1 is sufficient to answer the question "which of the positive numbers x or y is greater?" At that point, we can definitively rule out (C). Why? Because we definitely do NOT need both statements to decide if x is greater than y. If statement 1 is true -- whether x and y are integers, rationals, or irrationals -- y always has to be bigger.
Sure, if we take statements (1) and (2) together, that would give us exact values for x and y. But keep in mind: the question doesn't require exact values. We just need to decide if x is greater than y.
Now, since statement 2 is not sufficient on its own, we can eliminate B and D. So the final answer has to be (A).
I hope that helps!
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