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
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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.
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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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