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

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

beat this: number properties

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 258
Joined: Fri Jun 22, 2012 4:39 amFollowed by: 3 members
Location: Bengaluru, India
Thanked: 6 times
GMAT Score:640
by sachindia » Fri Nov 02, 2012 7:50 pm
If k is a +ve integer, is (k+1)/k an integer?

1)When k is divided by 5, 1 is the remainder.


1 is sufficient or insufficient ?

OA: Insufficient
Regards,
Sach
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |

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 Nov 02, 2012 8:06 pm
sachindia wrote:If k is a +ve integer, is (k+1)/k an integer?

1)When k is divided by 5, 1 is the remainder.


1 is sufficient or insufficient ?

OA: Insufficient
Target question: Is (k+1)/k an integer?

Notice that (k+1)/k = k/k + 1/k = 1 + 1/k

So, we can rephrase the target question as: Is 1 + 1/k an integer?

Since 1 is already an integer, we can simplify the target question even further: Is 1/k an integer?

Statement 1: When k is divided by 5, 1 is the remainder.
There several possible values of k. Here are two:
Case a: k = 1, in which case 1/k is an integer
Case b: k = 6, in which case 1/k is not an integer
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
Image
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 Nov 02, 2012 8:10 pm
When it comes to remainders, we have a nice rule that says:

If N divided by D, leaves remainder R, then the possible values of N include: R, R+D, R+2D, R+3D,. . .

So, if k divided by 5 leaves a remainder of 1, then the possible values of k include 1, 1+5, 1+(2)(5), 1+(3)(5), 1+(4)(5), etc

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 258
Joined: Fri Jun 22, 2012 4:39 amFollowed by: 3 members
Location: Bengaluru, India
Thanked: 6 times
GMAT Score:640

by sachindia » Fri Nov 02, 2012 8:23 pm
Amazing, Thanks a lot, Brent! This Qs is indeed from your Videos..

I never know R could also be the posssible value of N.

eg 1 divided by 5 will yield 0.2 .. if we go for decimal :D
Regards,
Sach
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 Nov 02, 2012 8:28 pm
sachindia wrote:Amazing, Thanks a lot, Brent! This Qs is indeed from your Videos..

I never know R could also be the posssible value of N.

eg 1 divided by 5 will yield 0.2 .. if we go for decimal :D
Let's work backwards:
5 divides into 16 three times with remainder 1 [notice that (3)(5)+1=16]
5 divides into 11 two times with remainder 1 [notice that (2)(5)+1=11]
5 divides into 6 one time with remainder 1 [notice that (1)(5)+1=6]
5 divides into 1 zero times with remainder 1 [notice that (0)(5)+1=1]

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