GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 18 Jan 2019, 22:30

Close

GMAT Club Daily Prep

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.

Close

Request Expert Reply

Confirm Cancel
Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
  • Free GMAT Strategy Webinar

     January 19, 2019

     January 19, 2019

     07:00 AM PST

     09:00 AM PST

    Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
  • FREE Quant Workshop by e-GMAT!

     January 20, 2019

     January 20, 2019

     07:00 AM PST

     07:00 AM PST

    Get personalized insights on how to achieve your Target Quant Score.

Product of Integers

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
User avatar
Joined: 12 Oct 2007
Posts: 24
Product of Integers  [#permalink]

Show Tags

New post 21 Aug 2008, 17:54
I just can't seem to understand this question and I really don't like the explanation. Hopefully someone can explain it better.
Question comes from PowerPrep Test 1

If the product of the integers w, x, y, and z is 770, and if 1 < w < x < y < z, what is the value of w + z?
10
13
16
18
21

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.


If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Director
Director
avatar
Joined: 23 Sep 2007
Posts: 742
Re: Product of Integers  [#permalink]

Show Tags

New post 21 Aug 2008, 18:06
770 = 2*5*7*11

w + z = 13

there is your answer
Intern
Intern
User avatar
Joined: 12 Oct 2007
Posts: 24
Re: Product of Integers  [#permalink]

Show Tags

New post 21 Aug 2008, 18:16
how exactly did you come up with the 2,5,7,11? Is it some kind of prime factor rule?
SVP
SVP
User avatar
Joined: 30 Apr 2008
Posts: 1821
Location: Oklahoma City
Schools: Hard Knocks
Re: Product of Integers  [#permalink]

Show Tags

New post 21 Aug 2008, 20:17
1
If you know the product of w, x, y & z is 770 and you cannot use 1 because every variable is larger than 1, as indicated by the stem.

You see that 77 * 10 - that gives you 2 numbers

77 breaks down to 7 * 11 and 10 breaks down to 2 * 5. These are all prime numbers. There isn't a way to break 770 in to 4 numbers where one of the numbers is NOT prime.

Because it is impossible to use 4 numbers to define 770 without using all prime numbers, we know that 2, 5, 7, 11 are the numbers which must be used and because the stem gives us the order, we can identify which numbers are w and z, therefore the sum will be 13.

freestyla86 wrote:
how exactly did you come up with the 2,5,7,11? Is it some kind of prime factor rule?


--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.


If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. 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$$.

GMAT Club Premium Membership - big benefits and savings

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 9433
Premium Member
Re: Product of Integers  [#permalink]

Show Tags

New post 19 Dec 2018, 05:17
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.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

GMAT Club Bot
Re: Product of Integers &nbs [#permalink] 19 Dec 2018, 05:17
Display posts from previous: Sort by

Product of Integers

  post reply Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: chetan2u, Gladiator59



Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.