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?
  1. Martha needs 10 cups of substance X
  2. 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
  1. The phrase "how much more of substance X does she need than substance Y" can be translated into algebra as: X - Y
  2. Evaluate Statement (1) alone.
    1. Although X = 10, there is no information about Y. Consequently, we cannot determine the value of X - Y
    2. Statement (1) is NOT SUFFICIENT.
  3. Evaluate Statement (2) alone.
    1. Y = 4 and the ratio of X:Y = 5:2. Consequently, X = 10 and X - Y = 10 - 4 = 6
    2. Statement (2) is SUFFICIENT.
  4. Since Statement (1) alone is NOT SUFFICIENT but Statement (2) alone is SUFFICIENT, answer B is correct.

Return to the list of practice GMAT data sufficiency questions.