Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

What is the source of this question? The question is certainly not GMAT specific. From statement II, you get a = -b, so a + b = 0 While from statement I, you get \((a + b) = \sqrt{8} or -\sqrt{8}\)

Both statements need to give at least one same value of a + b. It isn't possible that (a + b) is both 0 and \(\sqrt{8} or -\sqrt{8}\)

Data Sufficiency questions are like puzzles. I have an equation on a paper and I ask you, what is the sum of a and b? (Question Stem) You say that you do not know. I give you a hint - b - a = 2. (Statement I) You analyze the hint and say a + b is either root 8 or - root 8. I decide to give you another hint to solve the puzzle. b - a = 0. (Statement II) This is incorrect, isn't it? It is the same equation I am asking about. How can a + b be both 0 and either root 8 or - root 8. Since it is the same puzzle, my hints (i.e. the two statements) cannot contradict each other.
_________________

What is the source of this question? The question is certainly not GMAT specific. From statement II, you get a = -b, so a + b = 0 While from statement I, you get \((a + b) = \sqrt{8} or -\sqrt{8}\)

Both statements need to give at least one same value of a + b. It isn't possible that (a + b) is both 0 and \(\sqrt{8} or -\sqrt{8}\)

Data Sufficiency questions are like puzzles. I have an equation on a paper and I ask you, what is the sum of a and b? (Question Stem) You say that you do not know. I give you a hint - b - a = 2. (Statement I) You analyze the hint and say a + b is either root 8 or - root 8. I decide to give you another hint to solve the puzzle. b - a = 0. (Statement II) This is incorrect, isn't it? It is the same equation I am asking about. How can a + b be both 0 and either root 8 or - root 8. Since it is the same puzzle, my hints (i.e. the two statements) cannot contradict each other.

WOW! Interesting point, Karishma! I never thought about that when I was preparing for GMAT. So you are saying that ultimately the answer to the question (a+b) =? should have the same answer from the 2 hints and if the 2 hints give different answers then it doesn't make sense.

If I had figured that out, I would have saved sometime in the test!

So you are saying that ultimately the answer to the question (a+b) =? should have the same answer from the 2 hints and if the 2 hints give different answers then it doesn't make sense.

If I had figured that out, I would have saved sometime in the test!

+1 for the tip!

Yes, for it to be a valid GMAT question, if the two statements are giving you one possible solution each, they have to be the same. If you are getting multiple solutions from both the statements, at least one solution has to be common. e.g. Stmnt 1 could give you x = root 8 or - root 8

Stmnt 2 could give you x = root 8 or root 6 Answer would then be (C) since using both together you can say that x = root 8 (the only common solution).

Had stmnt 2 given you that x = root 8 or root -8 or root 6, then of course, even using both statements together, you couldn't get the answer since x could be root 8 or - root 8.

BTW, even if you had figured it out, you couldn't have obtained more than 51 in Quant!
_________________

It’s quickly approaching two years since I last wrote anything on this blog. A lot has happened since then. When I last posted, I had just gotten back from...

Since my last post, I’ve got the interview decisions for the other two business schools I applied to: Denied by Wharton and Invited to Interview with Stanford. It all...

Marketing is one of those functions, that if done successfully, requires a little bit of everything. In other words, it is highly cross-functional and requires a lot of different...