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

It is currently 16 Dec 2018, 14:05

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 December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
  • Free GMAT Prep Hour

     December 16, 2018

     December 16, 2018

     03:00 PM EST

     04:00 PM EST

    Strategies and techniques for approaching featured GMAT topics
  • FREE Quant Workshop by e-GMAT!

     December 16, 2018

     December 16, 2018

     07:00 AM PST

     09:00 AM PST

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

In the problem below, AB, CD, and EF are two-digit numbers,

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Intern
Intern
User avatar
Joined: 30 Nov 2013
Posts: 19
Location: India
Concentration: Finance, General Management
GMAT 1: 640 Q50 V25
GPA: 3.5
WE: Information Technology (Computer Software)
GMAT ToolKit User Reviews Badge
In the problem below, AB, CD, and EF are two-digit numbers,  [#permalink]

Show Tags

New post Updated on: 24 Dec 2013, 01:07
4
7
00:00
A
B
C
D
E

Difficulty:

  85% (hard)

Question Stats:

48% (02:12) correct 52% (02:18) wrong based on 198 sessions

HideShow timer Statistics

In the problem below, AB, CD, and EF are two-digit numbers, where A, B, C, D, E and F represent distinct digits from 1 to 9.

Is F prime?

A B
+ C D
______
E F

(1) B and D are consecutive integers.
(2) C = 8.

_________________

Kudos is the best way to say Thank you.
Believe in yourself! Practice more and good score in GMAT is for sure :)


Originally posted by madhavsrinivas on 23 Dec 2013, 10:26.
Last edited by Bunuel on 24 Dec 2013, 01:07, edited 1 time in total.
Edited the question.
Senior Manager
Senior Manager
avatar
Status: busyness school student
Joined: 09 Sep 2013
Posts: 419
Location: United States
Schools: Tepper '16 (M)
GMAT 1: 730 Q52 V37
Premium Member
Re: In the problem below, AB, CD, and EF are two-digit numbers,  [#permalink]

Show Tags

New post 23 Dec 2013, 11:22
2
2
1) B and D are consecutive integers.

B + D = F, so possible chioces are:
1+2=3
2+3=5
3+4=7
4+5=9
5+6=1
6+7=3
7+8=5
8+9=7

1) on its own is insufficient. 9 is not prime.



2) C = 8.

If C = 8, then A must equal 1. Otherwise, E will be greater than 9.
So C = 8 implies A = 1 and E = 9.

Still, this doesn't give enough information about F.
B and D could be 2 and 4, in which case F is 6 and not prime, or B and D could be 1 and 2, in which case F is 3, prime.



1) B and D are consecutive integers and 2) C = 8.

Looking at the possible choices from 1) given the constraint of 2), we can eliminate anything that has 1, 8, or 9. So the remaining possible choicse for B + D = F are:
2+3=5
3+4=7
6+7=3

Note, it can't actually be 6+7, because then there will be a carry over. But either way, 5 and 7 ae both prime.

Thus, answer is C - both statements are sufficient to answer the question.
_________________

My review of some of the CAT practice exams
You can usually find me on gmatclub's chat.

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 9184
Premium Member
Re: In the problem below, AB, CD, and EF are two-digit numbers,  [#permalink]

Show Tags

New post 23 Sep 2017, 02:37
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: In the problem below, AB, CD, and EF are two-digit numbers, &nbs [#permalink] 23 Sep 2017, 02:37
Display posts from previous: Sort by

In the problem below, AB, CD, and EF are two-digit numbers,

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


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®.