There are five main types of GMAT questions:
- Quantitative Comparison
- Problem Solving
- Sentence Correction
- Critical Reasoning
- Reading Comprehension
GMAT Quantitative Comparison Question
In these questions you have to determine if the statements contain the necessary information to answer the questions.
Is x > 4?
1) x  < 9
2) x is an integer
A) if statement (1) by itself is sufficient to answer the question, but statement (2) by itself is not;
B) if statement (2) by itself is sufficient to answer the question, but statement (1) by itself is not;
C) if statements (1) and (2) taken together are sufficient to answer the question, even though neither
statement by itself is sufficient;
D) If either statement by itself is sufficient to answer the question;
E) If statements (1) and (2) taken together are not sufficient to answer the question, requiring more data pertaining to the problem.
Solution
Statement (1) implies that x is in between +/- 3 (+/- means positive or negative). Both +3 and -3 are less than 4, so the answer is "NO" (x < 9) and (1) is sufficient, that is NO, x is not greater than 4.
A "NO" answer is equally acceptable as a "YES" answer. It is only necessary that there is sufficient information to answer the question. (2) does not provide any necessary information. The correct response is A, since statement (1) does provide enough information.
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