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 →

collection of tough problems from G PREP - 22

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 379
Joined: Tue Sep 30, 2008 7:17 amFollowed by: 11 members
Location: NY
Thanked: 28 times
by abhasjha » Sat Feb 06, 2010 5:41 am
If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k?

1) k > 35

2) The units digit of k is greater than 5.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1132
Joined: Mon Jul 20, 2009 3:38 amFollowed by: 6 members
Location: India
Thanked: 64 times
GMAT Score:760

by harsh.champ » Sat Feb 06, 2010 6:08 am
abhasjha wrote:If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k?

1) k > 35

2) The units digit of k is greater than 5.
Statement 1 alone :- k can range from 36 to 44.[k+5 ranges from 40 to 49]So, ten's digit cannot be determined.Though this statement was not needed and it was self-evident from the question only.
Statement 2 alone :-if units digit of k is greater than 5.Hence k can be 36,37,38,39.So, tens digit will be 3.

IMO B is the answer.
Last edited by harsh.champ on Sat Feb 06, 2010 3:12 pm, edited 1 time in total.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760

by sanju09 » Sat Feb 06, 2010 6:19 am
abhasjha wrote:If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k?

1) k > 35

2) The units digit of k is greater than 5.
When the tens digit of k + 5 is 4, the smallest k is 35.

(1) Now, when k > 35, there are so many cases when the tens digit of k + 5 is 4, which include 36 + 5 = 41 and 40 + 5 = 45. Insufficient

(2) This sounds same as info in (1) but is still different. We cannot take 40, 41, 42, 43, 44, and 45 for k now, and k = 46 onwards won't prove that the tens digit of k + 5 is 4 until we reach to the ranges 136 to 139, 236 to 239....2036 to 2039...., and in all these ranges for k, the tens digit of k remains to be 3 only. Sufficient

[spoiler]B[/spoiler]
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 1275
Joined: Thu Sep 21, 2006 11:13 pmFollowed by: 2 members
Location: Arabian Sea
Thanked: 125 times

by ajith » Sat Feb 06, 2010 9:08 am
abhasjha wrote:If k is a positive integer and the tens digit of k+5 is 4, what is the tens digit of k?

1) k > 35

2) The units digit of k is greater than 5.
Tens digit of k+5 is 4 which itself implies that
34<k<45

1.) tens digit can either b 3 or 4 - doesnt help at all ; Insufficient
2) units digit of k is greater than 5 - helps to conclude that tens digit of k is 3. (all the possible values with ten's digit 4 has units digit less than 5) - sufficient

[spoiler]B IMO - Posting only this part, doesn't help other than to increase the post count[/spoiler]
Always borrow money from a pessimist, he doesn't expect to be paid back.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 182
Joined: Mon Apr 20, 2009 7:09 pmFollowed by: 1 member
Thanked: 1 times

by akahuja143 » Sat Feb 06, 2010 1:09 pm
My Pick would be B..
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 379
Joined: Tue Sep 30, 2008 7:17 amFollowed by: 11 members
Location: NY
Thanked: 28 times

by abhasjha » Mon Feb 08, 2010 12:36 am
OA is B
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1