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

It is currently 16 Oct 2019, 06:16

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

If the least common multiple of two prime numbers x and y is 10, where

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58381
If the least common multiple of two prime numbers x and y is 10, where  [#permalink]

Show Tags

New post 08 Jun 2016, 10:08
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

84% (00:52) correct 16% (00:56) wrong based on 186 sessions

HideShow timer Statistics

Manager
Manager
User avatar
Joined: 19 Dec 2015
Posts: 108
Location: United States
GMAT 1: 720 Q50 V38
GPA: 3.8
WE: Information Technology (Computer Software)
Re: If the least common multiple of two prime numbers x and y is 10, where  [#permalink]

Show Tags

New post 08 Jun 2016, 10:19
3
LCM of two prime numbers will basically be multiple of those numbers. LCM = 10 = 2*5, both of which are prime.

Now we know x>y, so x=5 and y =2.
2x+y = 2*5 + 2 = 10 + 2 = 12. Hence D.
Current Student
User avatar
Joined: 18 Oct 2014
Posts: 804
Location: United States
GMAT 1: 660 Q49 V31
GPA: 3.98
GMAT ToolKit User
Re: If the least common multiple of two prime numbers x and y is 10, where  [#permalink]

Show Tags

New post 08 Jun 2016, 10:30
Bunuel wrote:
If the least common multiple of two prime numbers x and y is 10, where x > y, then the value of 2x + y is

A. 7
B. 9
C. 11
D. 12
E. 21


Since both are prime numbers there are only two factors for each 1 and the number itself.

LCM of two prime numbers = multiplication of the numbers

10= 2*5 or 5*2

But its given that x>y, hence x=5 and y =2

2x+y= 2*5 +2= 12

D is the answer
_________________
I welcome critical analysis of my post!! That will help me reach 700+
SVP
SVP
avatar
B
Joined: 06 Nov 2014
Posts: 1873
Re: If the least common multiple of two prime numbers x and y is 10, where  [#permalink]

Show Tags

New post 09 Jun 2016, 03:54
Bunuel wrote:
If the least common multiple of two prime numbers x and y is 10, where x > y, then the value of 2x + y is

A. 7
B. 9
C. 11
D. 12
E. 21


LCM (x,y) = 10 and both x an y are prime.
The only values of x and y can be 5 and 2 (x = 5 and y = 2)

2x + y = 2*5 + 2 = 12

Correct Option: D
Current Student
User avatar
D
Joined: 12 Aug 2015
Posts: 2569
Schools: Boston U '20 (M)
GRE 1: Q169 V154
GMAT ToolKit User
Re: If the least common multiple of two prime numbers x and y is 10, where  [#permalink]

Show Tags

New post 29 Apr 2017, 22:00
Excellent Question.
Here is what i did on this one ->
Since x,y are primes and x>y---->
LCM(x,y) => Product of x*y

Hence 10=xy
10=> 2*5

Thus x=5 ans y=2

So 2x+y=> 12

SMASH THAT D

_________________
GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 12 Sep 2015
Posts: 4003
Location: Canada
Re: If the least common multiple of two prime numbers x and y is 10, where  [#permalink]

Show Tags

New post 29 Jun 2019, 09:56
Top Contributor
Bunuel wrote:
If the least common multiple of two prime numbers x and y is 10, where x > y, then the value of 2x + y is

A. 7
B. 9
C. 11
D. 12
E. 21


2 and 5 are the only PRIME numbers with an LCM of 10
Since we're told x > y, we can conclude that x = 5 and y = 2

So, 2x + y = 2(5) + 2 = 12

Answer: D

Cheers,
Brent
_________________
Test confidently with gmatprepnow.com
Image
GMAT Club Bot
Re: If the least common multiple of two prime numbers x and y is 10, where   [#permalink] 29 Jun 2019, 09:56
Display posts from previous: Sort by

If the least common multiple of two prime numbers x and y is 10, where

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





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