• Magoosh
    Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

    MORE DETAILS
    Magoosh
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    MORE DETAILS
    Varsity Tutors
  • EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • Economist Test Prep
    Free Trial & Practice Exam
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    Economist Test Prep
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    MORE DETAILS
    Kaplan Test Prep
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    MORE DETAILS
    Target Test Prep
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    MORE DETAILS
    e-gmat Exclusive Offer

Digits

This topic has 9 member replies
beater Master | Next Rank: 500 Posts Default Avatar
Joined
22 Apr 2008
Posted:
301 messages
Upvotes:
2

Digits

Post Mon Sep 29, 2008 6:43 am
If the units digit of the three-digit positive integer k is nonzero, what is the tens digit of k?
(1) The tens digit of k + 9 is 3.
(2) The tens digit of k + 4 is 2.

  • +1 Upvote Post
  • Quote
  • Flag
Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
gmatguy16 Master | Next Rank: 500 Posts Default Avatar
Joined
23 Aug 2007
Posted:
124 messages
Upvotes:
2
Top Reply
Post Tue Sep 30, 2008 6:15 pm
can someone please explain how the oa is a,
if number =122 ,then 122+9 =131,tens digit is 3
if number =130, then 130+9=139 ,tens digit is 3 ,hence we have 2 different values of k ,2 and 3..did i mis u nderstood the question ?

  • +1 Upvote Post
  • Quote
  • Flag
Morgoth Master | Next Rank: 500 Posts
Joined
22 Sep 2008
Posted:
316 messages
Followed by:
1 members
Upvotes:
36
Target GMAT Score:
750+
Top Reply
Post Wed Oct 01, 2008 4:16 am
gmatguy16 wrote:
can someone please explain how the oa is a,
if number =122 ,then 122+9 =131,tens digit is 3
if number =130, then 130+9=139 ,tens digit is 3 ,hence we have 2 different values of k ,2 and 3..did i mis u nderstood the question ?
Units digit of the number cannot be 0. Therefore minimum value of the units digit can be 1 and maximum value can be 9. Try with these two values, yu should get the answer.

  • +1 Upvote Post
  • Quote
  • Flag
gmatguy16 Master | Next Rank: 500 Posts Default Avatar
Joined
23 Aug 2007
Posted:
124 messages
Upvotes:
2
Post Tue Sep 30, 2008 6:15 pm
can someone please explain how the oa is a,
if number =122 ,then 122+9 =131,tens digit is 3
if number =130, then 130+9=139 ,tens digit is 3 ,hence we have 2 different values of k ,2 and 3..did i mis u nderstood the question ?

  • +1 Upvote Post
  • Quote
  • Flag
Morgoth Master | Next Rank: 500 Posts
Joined
22 Sep 2008
Posted:
316 messages
Followed by:
1 members
Upvotes:
36
Target GMAT Score:
750+
Post Wed Oct 01, 2008 4:16 am
gmatguy16 wrote:
can someone please explain how the oa is a,
if number =122 ,then 122+9 =131,tens digit is 3
if number =130, then 130+9=139 ,tens digit is 3 ,hence we have 2 different values of k ,2 and 3..did i mis u nderstood the question ?
Units digit of the number cannot be 0. Therefore minimum value of the units digit can be 1 and maximum value can be 9. Try with these two values, yu should get the answer.

  • +1 Upvote Post
  • Quote
  • Flag
aj5105 Legendary Member Default Avatar
Joined
06 Jul 2008
Posted:
1169 messages
Followed by:
1 members
Upvotes:
25
Post Fri Jan 02, 2009 6:29 pm
IMO A

BTW neat expl !

Morgoth wrote:
beater wrote:
If the units digit of the three-digit positive integer k is nonzero, what is the tens digit of k?
(1) The tens digit of k + 9 is 3.
(2) The tens digit of k + 4 is 2.
IMO A

statement (1)

let k = xyz [3 digit, unit digit non zero]

x y z
++9
____
x30

minimum value of z can be 1 since it is non zero integer.
1+9 = 10
1 carry over to the tens y+1 = 3 , y =2

maximum value of z can be 9
9+9 = 18
1 carry over to the tens y+1 = 3 , y =2
Sufficient.

Statement (2)

x y z
++4
____
x2(z+4)

z=1, 1+4 = 5, y=2
z=9, 9+4 = 13, 1 carry over, if y=1, tens digit will be 2. Insufficient.

Thus, A.

OA?

  • +1 Upvote Post
  • Quote
  • Flag
gmattakers Junior | Next Rank: 30 Posts Default Avatar
Joined
29 Oct 2008
Posted:
25 messages
Post Wed Oct 29, 2008 7:29 pm
The answer in the OA is A

_________________
Taking the GMAT

  • +1 Upvote Post
  • Quote
  • Flag
beater Master | Next Rank: 500 Posts Default Avatar
Joined
22 Apr 2008
Posted:
301 messages
Upvotes:
2
Post Tue Sep 30, 2008 4:56 am
Opps! Sorry for the mess. OA = A. Thanks!

  • +1 Upvote Post
  • Quote
  • Flag
Morgoth Master | Next Rank: 500 Posts
Joined
22 Sep 2008
Posted:
316 messages
Followed by:
1 members
Upvotes:
36
Target GMAT Score:
750+
Post Tue Sep 30, 2008 2:13 am
What exactly is the OA, B or A?

  • +1 Upvote Post
  • Quote
  • Flag
beater Master | Next Rank: 500 Posts Default Avatar
Joined
22 Apr 2008
Posted:
301 messages
Upvotes:
2
Post Mon Sep 29, 2008 5:49 pm
OA - A. Thanks!



Last edited by beater on Tue Sep 30, 2008 4:56 am; edited 1 time in total

  • +1 Upvote Post
  • Quote
  • Flag

Best Conversation Starters

1 lheiannie07 112 topics
2 swerve 64 topics
3 LUANDATO 64 topics
4 ardz24 61 topics
5 AAPL 57 topics
See More Top Beat The GMAT Members...

Most Active Experts

1 image description Scott@TargetTestPrep

Target Test Prep

227 posts
2 image description Brent@GMATPrepNow

GMAT Prep Now Teacher

176 posts
3 image description Jeff@TargetTestPrep

Target Test Prep

168 posts
4 image description Rich.C@EMPOWERgma...

EMPOWERgmat

138 posts
5 image description GMATGuruNY

The Princeton Review Teacher

129 posts
See More Top Beat The GMAT Experts