Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 08 Feb 2016, 04:56

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Is √(56x) an integer?

Author Message
TAGS:
Director
Joined: 17 Apr 2013
Posts: 633
Schools: HBS '16 (II)
GMAT 1: 710 Q50 V36
GMAT 2: 750 Q51 V41
GMAT 3: 790 Q51 V49
GPA: 3.3
Followers: 36

Kudos [?]: 236 [1] , given: 287

Is √(56x) an integer? [#permalink]  01 Dec 2013, 16:36
1
KUDOS
00:00

Difficulty:

65% (hard)

Question Stats:

53% (02:22) correct 47% (01:12) wrong based on 141 sessions
Is √(56x) an integer?

(1) x is a multiple of 14.
(2) 28 is not a factor of x.
[Reveal] Spoiler: OA

_________________

Like my post Send me a Kudos It is a Good manner.
My Debrief: how-to-score-750-and-750-i-moved-from-710-to-189016.html

Math Expert
Joined: 02 Sep 2009
Posts: 31286
Followers: 5345

Kudos [?]: 62155 [0], given: 9444

Re: Is √(56x) an integer? [#permalink]  02 Dec 2013, 01:06
Expert's post
Is √(56x) an integer?

$$\sqrt{56x}=2\sqrt{14x}$$.

(1) x is a multiple of 14. If x=14, then the answer is YES but if x=14*3, then the answer is NO. Not sufficient.

(2) 28 is not a factor of x. Consider the same examples. Not sufficient.

(1)+(2) Consider the same examples. Not sufficient.

_________________
Current Student
Joined: 06 Sep 2013
Posts: 2036
Concentration: Finance
GMAT 1: 770 Q0 V
Followers: 39

Kudos [?]: 433 [0], given: 355

Re: Is √(56x) an integer? [#permalink]  06 Jan 2014, 09:16
honchos wrote:
Is √(56x) an integer?

(1) x is a multiple of 14.
(2) 28 is not a factor of x.

OK here's the deal

We need to know if X has at least 2 and a 7^2 for 56x to be a perfect square

Statement 1

Is a multiple of 2*7, OK, thanks for the info but we are still missing one 7

Statement 2

Not a factor of 2^2*7. Well OK, doesn't have a square power of 2 but could as well have a square power of 7. I need more info

Statement 1 and 2 together

Well we are still missing that 7!!

Cheers!
If it helps Kudos me ok?

J
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 8175
Followers: 416

Kudos [?]: 111 [0], given: 0

Re: Is √(56x) an integer? [#permalink]  23 Jul 2015, 23:45
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 √(56x) an integer?   [#permalink] 23 Jul 2015, 23:45
Similar topics Replies Last post
Similar
Topics:
If a is an integer, is b an integer? 8 03 Apr 2015, 03:47
4 Is a an integer? 1 31 Oct 2014, 12:35
4 If x is an integer, is y an integer? 7 28 Feb 2014, 03:01
1 If x is an integer, is y an integer? 14 28 Apr 2012, 20:25
1 If p is an integer, is q an integer? 2 11 Feb 2012, 17:41
Display posts from previous: Sort by