Hi All,

In this DS question, you might find that 'rewriting' the question makes it easier to answer. Either way, you'll find that a combination of logic, Number Properties and TESTing VALUES will come in handy.

We're asked if 2X - 3Y < X^3. You can 'rewrite' the question to ask if 2X < X^3 + 3Y. Either way, this is a YES/NO question.

Fact 1: 2X - 3Y = -2

Here, the 'original' version of the question is probably easier to answer, since we now have a value that we can 'substitute' in for (2X - 3Y)....

The question now asks.....

Is -2 < X^3?

The answer to this question depends completely on the value of X.

IF....

X = 0, then the answer to the question is YES

X = -2, then the answer to the question is NO

Fact 1 is SUFFICIENT

Fact 2: X > 2 and Y > 0

With this Fact, the 'rewritten' version of the question is probably easier to answer.

Since we know that X > 2......2X will ALWAYS be < X^3. We also know that Y > 0, so (X^3 + 3Y) will get larger as Y gets larger. This all serves as evidence that....

2X is ALWAYS < X^3 + 3Y.

Fact 2 is SUFFICIENT

Final Answer:

GMAT assassins arne't born, they're made,

Rich

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Official Guide 2016 Question Breakdown:

http://gmatclub.com/forum/empowergmat-blog-198415.html#p1527977

Rich Cohen

Rich.C@empowergmat.com

http://www.empowergmat.com

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