Practice GMAT Data Sufficiency Question
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Chef Martha is preparing a pie for a friend's birthday. How much more of substance X does she need than substance Y?
 Martha needs 10 cups of substance X
 Martha needs the substances W, X, Y, and Z in the ratio: 15:5:2:1 and she needs 4 cups of substance Y
Correct Answer: B
 The phrase "how much more of substance X does she need than substance Y" can be translated into algebra as: X  Y

Evaluate Statement (1) alone.
 Although X = 10, there is no information about Y. Consequently, we cannot determine the value of X  Y
 Statement (1) is NOT SUFFICIENT.

Evaluate Statement (2) alone.
 Y = 4 and the ratio of X:Y = 5:2. Consequently, X = 10 and X  Y = 10  4 = 6
 Statement (2) is SUFFICIENT.
 Since Statement (1) alone is NOT SUFFICIENT but Statement (2) alone is SUFFICIENT, answer B is correct.
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