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

 It is currently 17 Jan 2019, 07:11

### 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 January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
• ### The winning strategy for a high GRE score

January 17, 2019

January 17, 2019

08:00 AM PST

09:00 AM PST

Learn the winning strategy for a high GRE score — what do people who reach a high score do differently? We're going to share insights, tips and strategies from data we've collected from over 50,000 students who used examPAL.
• ### 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.

# If j is a multiple of 12, and k is a multiple of 21, then jk must be a

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 52230
If j is a multiple of 12, and k is a multiple of 21, then jk must be a  [#permalink]

### Show Tags

30 Oct 2018, 23:56
1
00:00

Difficulty:

15% (low)

Question Stats:

85% (00:55) correct 15% (01:05) wrong based on 39 sessions

### HideShow timer Statistics

If j is a multiple of 12, and k is a multiple of 21, then jk must be a multiple of which of the following?

A. 8
B. 15
C. 22
D. 28
E. 35

_________________
Director
Joined: 31 Oct 2013
Posts: 951
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: If j is a multiple of 12, and k is a multiple of 21, then jk must be a  [#permalink]

### Show Tags

31 Oct 2018, 00:13
Bunuel wrote:
If j is a multiple of 12, and k is a multiple of 21, then jk must be a multiple of which of the following?

A. 8
B. 15
C. 22
D. 28
E. 35

j = 12k

k = 21k

Lcm of 12 and 21 : 84 ...........the minimum value of jk

28 * 3 = 84.
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 8787
Location: Pune, India
Re: If j is a multiple of 12, and k is a multiple of 21, then jk must be a  [#permalink]

### Show Tags

31 Oct 2018, 01:29
Bunuel wrote:
If j is a multiple of 12, and k is a multiple of 21, then jk must be a multiple of which of the following?

A. 8
B. 15
C. 22
D. 28
E. 35

j = 12a
k = 21b

$$jk = 12*21 * a * b = 2^2 * 3^2 * 7 * ab$$

The option which is a factor of 2^2 * 3^2 * 7 will be correct.
$$28 = 2^2 * 7$$

_________________

Karishma
Veritas Prep GMAT Instructor

Re: If j is a multiple of 12, and k is a multiple of 21, then jk must be a &nbs [#permalink] 31 Oct 2018, 01:29
Display posts from previous: Sort by