GMAT: Questions

Question:

Does the average of

and

equal

Statement (1):

Statement (2):

Choices:


	A.		Statement(1) BY ITSELF is sufficient to answer the question, but statement (2) by itself is not.
	B.		Statement (2) BY ITSELF is sufficient to answer the question, but statement (1) by itself is not.
	C.		Statements (1) and (2) TAKEN TOGETHER are sufficient to answer the question, even though NEITHER statement BY ITSELF is sufficient.
	D.		EITHER statement BY ITSELF is sufficient to answer the question.
	E.		Statements (1) and (2) TAKEN TOGETHER are NOT sufficient to answer the question and more data pertaining to the problem is required.

First, look at the question stem. You have to determine what kind of

information you will need to answer the question. In this case, you would

need to use the average formula: Average = Sum

Number of Terms.

So the question here is: Does

(

)

In order to answer this question, you would need to know the sum of

and

and the value of

Now you can turn to the statements. You can

start with either statement, and since statement (2) looks simpler, start

with that. You are told that

That does not help you find the sum of

and

so (2) is insufficient.

Now look at Statement (1). You can rearrange this equation by adding

and subtracting

from each side, leaving you with

This

does not tell you the value of

so it is insufficient as well.

Now look at both statements together. You now have the sum of

and

and the value of

so you can answer the question. The correct answer

to this question, then, is choice (3).

GMAT: Data Sufficiency Question #1