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 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

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
Limited cohort · enrollment openTarget 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.

If 2-digit positive integer n is 12 times of the tens digit

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Elite Legendary Member
Posts: 3991
Joined: Fri Jul 24, 2015 2:28 amFollowed by: 37 members
Location: Las Vegas, USA
Thanked: 19 times
by Max@Math Revolution » Sun Jun 19, 2016 4:56 pm
If 2-digit positive integer n is 12 times of the tens digit of n, what is the value of n?
1) The tens digit of n is 3.
2) The sum of the tens digit and the units digit of n is 9.

*AN answer will be posted in 2 days.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Elite Legendary Member
Posts: 3991
Joined: Fri Jul 24, 2015 2:28 amFollowed by: 37 members
Location: Las Vegas, USA
Thanked: 19 times

by Max@Math Revolution » Tue Jun 21, 2016 4:19 pm
There are 3 variables (n, a, b) and 1 equation (10a+b=12a) in the original condition. Since we need 1 more equation, the correct answer is D.
 
- Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 16207
Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members
Location: Vancouver, BC
Thanked: 5254 times
GMAT Score:770

by Brent@GMATPrepNow » Fri Jun 24, 2016 10:25 am
Max@Math Revolution wrote:If 2-digit positive integer n is 12 times the tens digit of n, what is the value of n?

1) The tens digit of n is 3.
2) The sum of the tens digit and the units digit of n is 9.
Target question: What is the value of n?

Given: 2-digit positive integer n is 12 times the tens digit of n
Let's see what 2-digit integers meet this condition.
Case a: If the tens digit of n is 1, then n could be 12
Case b: If the tens digit of n is 2, then n could be 24
Case c: If the tens digit of n is 3, then n could be 36
Case d: If the tens digit of n is 4, then n could be 48
That's it! There are no other possible values of n.
So, n must be one of these four values.
No onto the statements...

Statement 1: The tens digit of n is 3
When we check our 4 possible cases, we see that case c (n = 36) is the only one that meets the information provided in statement 1.
So, n MUST equal 36
Since we can answer the target question with certainty, statement 1 is SUFFICIENT

Statement 2: The sum of the tens digit and the units digit of n is 9.
When we check our 4 possible cases, we see that case c (n = 36) is the only one that meets the information provided in statement 1.
So, n MUST equal 36
Since we can answer the target question with certainty, statement 2 is SUFFICIENT

Answer = D

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1