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:

Answer = A. The explanation in the MGMAT is a bit confusing though. It states that z is NOT divisible by 2, and because of this, it is not divisible by 6. However, this statement is SUFFICIENT.

Re: Divisibility Problem [#permalink]
08 Aug 2011, 08:25

But what you gave us to answer the question, the OA reveals the answer is A.... however, we don't even know what A is. You need to post the choices in the question as well A or B or C or D or E so that we can use elimination or consider the choices themselves _________________

“Focus on the journey, not the destination. Joy is found not in finishing an activity but in doing it.” - Greg Anderson

Re: Divisibility Problem [#permalink]
08 Aug 2011, 08:29

I must be missing something...

But here you go.

Answers=

A) Statement #1 is sufficient alone. B) Statement #2 is sufficient alone. C) Statement's #1 and #2 are sufficient when only put together. D) Statement's #1 and #2 are sufficient seperately on their own. E) Statement's #1 and #2 together are not sufficient.

Re: Divisibility Problem [#permalink]
08 Aug 2011, 08:34

2

This post received KUDOS

restore wrote:

Is the integer z divisible by 6?

1) The greatest common factor of z and 12 is 3. 2) The greatest common factor of z and 15 is 15.

statement 1 is sufficient, if GCF of z and 12 is 3, it means z is not divisible by 6. For if Z were divisible by 6 the GCF would not have been 3.

Statement 2 is not sufficient to answer the question. if GCF of z and 15 is 15, Z could be either 15 (or multiple of 15) or 30 (or multiple of 30). If z is 15 it is not divisible by 6 and if it is 30 it is divisible by 6. Insufficient.

Re: Is the integer z divisible by 6? 1) The greatest common [#permalink]
28 Nov 2013, 11:39

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________

Re: Is the integer z divisible by 6? [#permalink]
29 Nov 2013, 01:29

Expert's post

Is the integer z divisible by 6?

Realistic GMAT question would mention that z is a positive integer.

(1) The greatest common factor of z and 12 is 3 --> if z were divisible by 6 (for example 6, 12, 18, ...) then the GCF of z and 12 (which is also divisible by 6) would have been more than 3 (6 or 12) and since the GCF is 3 then z is not divisible by 6. Sufficient.

(2) The greatest common factor of z and 15 is 3 --> if z=3 then the answer is NO but if z=6 then the answer is YES. Two different answers, not sufficient.

On September 6, 2015, I started my MBA journey at London Business School. I took some pictures on my way from the airport to school, and uploaded them on...

When I was growing up, I read a story about a piccolo player. A master orchestra conductor came to town and he decided to practice with the largest orchestra...

Last week, hundreds of first-year and second-year students traversed the globe as part of KWEST: Kellogg Worldwide Experience and Service Trip. Kyle Burr, one of the student-run KWEST executive...