Don’t Let Data Sufficiency Be Your Fear Factor: GMAT Question of the Day

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Don’t Let Data Sufficiency Be Your Fear Factor: GMAT Question of the Day

GMAT Question of the Day: Data Sufficiency
Explanation
Statement (1) Factoring x2 − 15x + 50 = 0 gives us (x − 10)(x − 5) = 0. Since x could be 5 or 10, and we don't know y, this statement alone is insufficient.

The correct answer could be B, C, or E.

Statement (2) Subtracting 5 from both sides and factoring gives us y(y − 10) = 0. Since y could be 0 or 10, and we don't know x, this statement alone is insufficient.

The correct answer must be C or E.

Statement (1 & 2) Taken together, we have x = 5 or 10 and y = 0 or 10. Since the possible values for xy are 0, 50, or 100, the statements together are insufficient.

The correct choice is E.