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 350,000 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:

Statement 1 provides us with value of x but it is insufficient to answer the whole question

Statement 2 provides us with necessary information: we need to multiply the second statement times 1.5 and we will get our result: \(33 = 9y^2 + 6x^2\)

How is x = 2 no sufficient? If we know the value for x we can solve for y and then add the two.

When the question says "What is the value of..." the question is asking if we have enough information to determine a single value. There are 2 variables in the equation provided (x and y) and S1 only gives us a value for x. The equation is not equal to anything, ti's just an equation. IF THE QUESTON HAD provided the equation of \(6x^2 + 9y^2 = 33\), then providing us with the value of a single variable WOULD be enough to find the value of y and therefore would be sufficient, but this information is still missing. Look at every problem as if it has 2 varaibles.

a = b

Sometimes we know one variable, such as a = 2. If a = 2, then b = 2. If we have a more complext problem, we have \(a^2 + b = c\). Now we have 3 variables. This is similar to the equation given. While the question isn't written with that third variable visible, it is present. Its the variable we're trying to solve for. It \(6x^2 + 9y^2 = z\) and we need to find z. So anytime you have 3 variables, in order to solve for the entire equation to a single value, you need to know the value of AT LEAST 2 of those variables. [There are exceptions to this, but as a general rule, knowing the information necessary to solve the equation is a vital step in doing Data Sufficiency questions.]

smarinov wrote:

What is the value of the following expression: \(6x^2 + 9y^2?\)

1. \(x = 2\) 2. \(6y^2 + 4x^2 = 22\)

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient * Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient * BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient * EACH statement ALONE is sufficient * Statements (1) and (2) TOGETHER are NOT sufficient

Statement 1 provides us with value of x but it is insufficient to answer the whole question

Statement 2 provides us with necessary information: we need to multiply the second statement times 1.5 and we will get our result: \(33 = 9y^2 + 6x^2\)

How is x = 2 no sufficient? If we know the value for x we can solve for y and then add the two.

Thank you.

_________________

------------------------------------ J Allen Morris **I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

smarinov, you could solve for Y ONLY and ONLY provided that you knew the original equation equals zero or any other number. Yes, you know x=2. Just imagine the other side of the equation is 0, you say then you can solve for y and y=square root of 24/9

What if the original equation was 6x^2 + 9y^2=6 ?? Actually the question is asking us to find this 6. Then substituting 2 for x, y would equal 2, which is different from the Y we got by assuming zero is on the other side of the equation.

Hope it helps _________________

Ambition, Motivation and Determination: the three "tion"s that lead to PERFECTION.

World! Respect Iran and Iranians as they respect you! Leave the governments with their own.

Not sure if this was indeed a very hard DS question. Was relatively straight forward that statement (ii) is sufficient. I had to re-check if I was missing anything with statement (i) since (ii) was rather obvious.

The answer I chose was B. _________________

My attempt to capture my B-School Journey in a Blog : tranquilnomadgmat.blogspot.com

Statement 1: Useless. We have no information about y Statement 2: Can be reduced to 2x^2 + 3y^2 = 11. The equation in the question stem is fairly similar to this one ----> by multiplying the equation in statement 2 by 3 we end up with the equation in the stem. Therefore, it must also equal 33. Sufficient.

What is the value of the following expression: \(6x^2 + 9y^2?\)

1. \(x = 2\) 2. \(6y^2 + 4x^2 = 22\)

S1 doesn't tell you anything about y, eliminate A, D. If you just factor out the original question and S2 you can form a ratio between the 2, and thus get an exact value. Correct answer is B.

It's basic algebra; an expression is different than an equation.

"An equation contains an equal sign, expressions do not. An expression, even one that contains variables, represents a value. Even if you don't know that value, nothing you do to an expression can change its value." mgmat