Practice GMAT Data Sufficiency Question
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n is a positive number; z – 15 is also a positive number; is z/n less than one?
 z – n > 0
 n < 15
Correct Answer: D
 The value of a fraction is less than one if its numerator is smaller than its denominator. For example, 4/6 is less than one because 4 < 6. So, the question at hand can be simplified to: is z < n?

Evaluate Statement (1) alone.
 Statement (1) can be rearranged:
z  n > 0
z > n  Since z > n, you can definitively answer no to the question: "is z < n?"
 Statement (1) is SUFFICIENT.
 Statement (1) can be rearranged:

Evaluate Statement (2) alone.
 Based upon the question, since z15 is a positive number, the following inequality must hold:
z  15 > 0
z > 15  Statement (2) says:
n < 15  Since z > 15 and n < 15, you know that z > n
 You can definitively answer no to the question: "is z < n?"
 Statement (2) is SUFFICIENT.
 Based upon the question, since z15 is a positive number, the following inequality must hold:
 Since Statement (1) alone is SUFFICIENT and Statement (2) alone is SUFFICIENT, answer D is correct.
Return to the list of practice GMAT data sufficiency questions.