Does 8x = 16 + 2x? (1) -3x is greater than or equal to -9. (2) 2x is greater than or equal to 6.

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, meaning that further information would be needed to answer the question.

(B) We can simplify 8x = 16 + 2x by subtracting 2x from both sides, resulting in 6x = 16, or x = 8/3. So, the question is essentially asking whether x equals 8/3. If a statement provides enough information to answer yes or no in a definitive manner, then the statement is sufficient.

Statement (1) tells us that -3x is greater than or equal to -9. After dividing by -3, we get x is less than or equal to 3 (remember to change the direction of the inequality when multiplying or dividing by a negative number). If x can be any number less than or equal to 3, then we do not know for sure whether x equals 8/3. So, Statement (1) is insufficient.

Statement (2) tells us that x is greater than or equal to 3. This means that x could NEVER be less than 3, and therefore could NEVER be equal to 8/3. If we go back to the original statement,Does 8x = 16 + 2x?, we see that the answer is definitely NO (it is never yes).

Remember that your goal in Data Sufficiency questions is to determine whether or not you have enough information to answer the question. The answer does not have to be yes. If the answer is always no, the statement is also sufficient. So, Statement (2) is sufficient because the answer is always no.

Since only Statement (2) is sufficient, the answer must be (B). ----------

By solving this equation we find that if 8x DOES equal 16 plus 2x, then x must equal 8/3, or 2 and 2/3.

statement 1 tells us x is less than or equal to 3 statement 2 tells us x is greater than or equal to 3

Either statement is SUFFICIENT to answer the question. if we take statement 1, then 8x DOES equal 16 + 2x.

However, if we take statement 2, then it does not. Either statement is sufficient to answer the question, though they each yield different answers.

There is NO contradiction. Like in many other data sufficiency questions: - each statement alone defines a possible range of values; - the both statements combined result in the intersection of those ranges; - if all the elements in the intersection answer the statement question identically, then the both statements combined are sufficient.

(1) -3x is greater than or equal to -9 x ≤ 3 Tells us that the possible values of x are:

(2) 2x is greater than or equal to 6 x ≥ 3 Tells us that the possible values of x are:

When we combine the both statements the range of possible values is just one point:

In similar questions this intersection could be some other range, like 1 < x < 2 or -1 < x ≤ 0, etc.

Apparently, you confused given information and what the question was asking. Look at these two different statements to feel the difference: "If x = 8/3 then x ≤ 3" is TRUE. "If x ≤ 3 then x = 8/3" is NOT TRUE.

In this particular problem the question asks: "Is x = 8/3 ?". The given information is: 1) Statement (1) alone: x ≤ 3 2) Statement (2) alone: x ≥ 3 3) The both statements combined: x = 3

1) If we know that x ≤ 3 then xcan be 8/3. But it also can be 3, or any other value less than 3. So we can not give a definite answer to the question. Statement (1) by itself is NOT sufficient.

Question: Does 8x = 16 + 2x IF -3x ≥ -9? Answer: It can be, but not necessarily.

2) If we know that x ≥ 3 then x definitely cannot be 8/3. So we can give the definite answer to the question. This definite answer is "NO".

Question: Does 8x = 16 + 2x IF 2x ≥ 6? Answer: NO.

The information in Statement (2) is sufficient to answer the question, while the information in Statement (1) is NOT sufficient to answer the question.

Users browsing this forum: No registered users and 3 guests

You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum

GMAT(TM) and GMAT CAT (TM) are registered trademarks of the Graduate Management Admission Council(TM). The Graduate Management Admission Council(TM) does not endorse, nor is affiliated in any way with the owner or any content of this site.