BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Is the positive integer n a multiple of 24?

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Senior | Next Rank: 100 Posts
Posts: 97
Joined: Mon Oct 14, 2013 11:48 pmFollowed by: 1 member
Thanked: 5 times
by amirhakimi » Fri Nov 01, 2013 11:55 pm
Is the positive integer n a multiple of 24?

(1) n is a multiple of 4.
(2) n is a multiple of 6.

Answer is E

[spoiler]24=3x2x2x2[/spoiler]

[spoiler](1) 4=2x2 Not Sufficient[/spoiler]
[spoiler](2) 3=3x2 Not Sufficient[/spoiler]

[spoiler](1)&(2) Although it might be tricky to infer that if n has 2x2 and 3x2 as factors, it should have 3x2x2x2 as factors, 4&6 have factor 2 in common and n can be 12 which is not multiple of 24. n can also be 24 which is multiple of 24. Not Sufficient [/spoiler]

Can we create this general rule? ---> In order for A to be divisible by X, while A is dividable by Y, Z, LCM of Y,Z should be dividable by X
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1556
Joined: Tue Aug 14, 2012 11:18 pmFollowed by: 34 members
Thanked: 448 times
GMAT Score:650

by theCodeToGMAT » Sat Nov 02, 2013 12:05 am
To find: "n" multiple of 24
24 x _ = "n"

Statement 1:
"n" is a multiple of 4
4 x A = n
A can be any number as we don't have any specific value of "n"
INSUFFICIENT


Statement 2:
"n" is a multiple of 6
6 x B = n
B can be any number as we dont have any specific value of "n"
INSUFFICIENT

Combining...
4 x A = n
6 x B = n
"n" can be
12 -> Not a multiple of 24
24 -> yes a multiple of 24
INSUFFICIENT

Answer [spoiler]{E}[/spoiler]
R A H U L
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Senior | Next Rank: 100 Posts
Posts: 97
Joined: Mon Oct 14, 2013 11:48 pmFollowed by: 1 member
Thanked: 5 times

by amirhakimi » Sat Nov 02, 2013 12:10 am
Thanks for the reply, but my question is this:

Can we create this general rule? ---> In order for A to be divisible by X, while A is dividable by Y, Z, LCM of Y,Z should be dividable by X

It was kinda CR post ;)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 1556
Joined: Tue Aug 14, 2012 11:18 pmFollowed by: 34 members
Thanked: 448 times
GMAT Score:650

by theCodeToGMAT » Sat Nov 02, 2013 12:19 am
amirhakimi wrote:Thanks for the reply, but my question is this:

Can we create this general rule? ---> In order for A to be divisible by X, while A is dividable by Y, Z, LCM of Y,Z should be dividable by X

It was kinda CR post ;)
Yes!.. the rule makes sense.

but, for GMAT, avoid making generalized rules; rather apply simple mathematics... You may end up spending 1 minute extra on the question, but you won't be confused between complex rules.
R A H U L
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Senior | Next Rank: 100 Posts
Posts: 97
Joined: Mon Oct 14, 2013 11:48 pmFollowed by: 1 member
Thanked: 5 times

by amirhakimi » Sat Nov 02, 2013 12:32 am
I just wanted to make sure whether if my logic was right. Thanks my friend :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 1556
Joined: Tue Aug 14, 2012 11:18 pmFollowed by: 34 members
Thanked: 448 times
GMAT Score:650

by theCodeToGMAT » Sat Nov 02, 2013 3:12 am
amirhakimi wrote:I just wanted to make sure whether if my logic was right. Thanks my friend :)
You are welcome!
R A H U L
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
Elite Legendary Member
Posts: 10392
Joined: Sun Jun 23, 2013 6:38 pmFollowed by: 511 members
Location: Palo Alto, CA
Thanked: 2867 times
GMAT Score:800

by [email protected] » Sat Nov 02, 2013 6:14 pm
Hi amirhakimi,

In these types of multiple/factor questions, sometimes the fastest way to get to the correct answer is to TEST Values. Here's how:

We're asked if N is a multiple of 24? This is a YES/NO question.

Fact 1: N is a multiple of 4

If N = 4, then the answer to the question is NO.
If N = 24, then the answer to the question is YES.
Fact 1 is INSUFFICIENT.

Fact 2: N is a multiple of 6

If N = 6, then the answer to the question is NO.
If N = 24, then the answer to the question is YES.
Fact 2 is INSUFFICIENT.

Combined, N is a multiple of 4 AND a multiple of 6:

If N = 12, then the answer to the question is NO.
If N = 24, then the answer to the question is YES.
Combined, INSUFFICIENT.

Final Answer: E

GMAT assassins aren't born, they're made,
Rich
Contact Rich at [email protected]
Image
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
GMAT Instructor
Posts: 2630
Joined: Wed Sep 12, 2012 3:32 pmFollowed by: 119 members
Location: East Bay all the way
Thanked: 625 times
GMAT Score:780

by Matt@VeritasPrep » Sat Nov 02, 2013 11:07 pm
amirhakimi wrote:Can we create this general rule? ---> In order for A to be divisible by X, while A is dividable by Y, Z, LCM of Y,Z should be dividable by X


I like the thought process here, but I'd phrase this as "If the integer K is divisible by the integers L and M, then K is also divisible by the LCM of L and M." The GMAT loves to test divisibility, so this is a great property to know.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1