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:

Re: If x, y and z are positive, is x = y/z^2 [#permalink]

Show Tags

19 Jul 2013, 01:36

Question:

If we quickly conclude that the question "is x = y/z^2" can be answered only if we can isolate x on one side and y and z on the other side, would that not be enough to conclude whether or not "x = y/z^2"?

This would save a lot of time, instead of doing calculations you simply determine what you need quickly.

But just to double check with you experts if my reasoning is correct, would this SAME reasoning apply if we were given the info in one of the two statments that: "z = x/y" or for that matter "zy*x = y/z" . These two statments CAN be "solved" with my reasoning because both statments only have x, y and z and thus x can be expressed in terms of y and z. Therefore, we can conclude if "x = y/z^2"

Re: If x, y and z are positive, is x = y/z^2 [#permalink]

Show Tags

19 Jul 2013, 01:43

Expert's post

aeglorre wrote:

Question:

If we quickly conclude that the question "is x = y/z^2" can be answered only if we can isolate x on one side and y and z on the other side, would that not be enough to conclude whether or not "x = y/z^2"?

This would save a lot of time, instead of doing calculations you simply determine what you need quickly.

But just to double check with you experts if my reasoning is correct, would this SAME reasoning apply if we were given the info in one of the two statments that: "z = x/y" or for that matter "zy*x = y/z" . These two statments CAN be "solved" with my reasoning because both statments only have x, y and z and thus x can be expressed in terms of y and z.

Not sure I understand completely what you mean but if one of the statements were z = x/y, then it wouldn't be sufficient. _________________

Re: If x, y and z are positive, is x = y/z^2 [#permalink]

Show Tags

19 Jul 2013, 01:52

Bunuel wrote:

aeglorre wrote:

Question:

If we quickly conclude that the question "is x = y/z^2" can be answered only if we can isolate x on one side and y and z on the other side, would that not be enough to conclude whether or not "x = y/z^2"?

This would save a lot of time, instead of doing calculations you simply determine what you need quickly.

But just to double check with you experts if my reasoning is correct, would this SAME reasoning apply if we were given the info in one of the two statments that: "z = x/y" or for that matter "zy*x = y/z" . These two statments CAN be "solved" with my reasoning because both statments only have x, y and z and thus x can be expressed in terms of y and z.

Not sure I understand completely what you mean but if one of the statements were z = x/y, then it wouldn't be sufficient.

What I mean is that if our stem asks us "is x = y/z^2", then what we need in order to determin IF "x = y/z^2" is what x is, in relation to y and z.

Statment 1 gives us an equation where we CAN put x in relation to y and z, thus this equation is enough to determine "is x = y/z^2". Statment 2 also give us enough for us to put x in relation to y and z, thus we have enough info to determine if "is x = y/z^2"

This is a very quick way in this DS question to conclude whether we have enough info or not, but Im not sure if it is completely bulletproof.

EDIT: Ah.. I see it isn't completely bulleproof because z^2 has two answers, z can be positive or negative, which we don't know, so the statment can be insufficent..

gmatclubot

Re: If x, y and z are positive, is x = y/z^2
[#permalink]
19 Jul 2013, 01:52

So, my final tally is in. I applied to three b schools in total this season: INSEAD – admitted MIT Sloan – admitted Wharton – waitlisted and dinged No...

HBS alum talks about effective altruism and founding and ultimately closing MBAs Across America at TED: Casey Gerald speaks at TED2016 – Dream, February 15-19, 2016, Vancouver Convention Center...