NEW HERE? LEARN MORE
closeclose
Last visit was: 28 Apr 2024, 00:54 It is currently 28 Apr 2024, 00:54
Decision Tracker
My Rewards
New posts
New comers' posts

Close
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
Your Progress

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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

Both a, b, and c are 3-digits integers, where a=b+c. Is the

User avatar
vcbabu
Manager
Manager
Joined: 04 Sep 2006
Posts: 99
Own Kudos [?]: 332 [0]
Given Kudos: 0
Send PM
Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink] New post   27 Jun 2009, 22:30
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
Hide Show timer Statistics
. Both a, b, and c are 3-digits integers, where a=b+c. Is the hundreds' digit of number a equal to sum of that of b and c?
1). Tens' digit of a=tens' digit of b+tens' digit of c
2). Units' digit of a=units' digit of b + units' digit of c



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
mdfrahim
Manager
Manager
Joined: 28 Jan 2004
Posts: 94
Own Kudos [?]: 55 [0]
Given Kudos: 4
Location: India
Send PM
Re: Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink] New post   28 Jun 2009, 19:38
C.

Let the number be as follows
a = 100D + 10E + F
b = 100G + 10H + I
c = 100J + 10K + L

As per question
a = b + c
100D + 10E + F = (100G + 10H + I) + (100J + 10K + L)

stmt 1.
E = H + K
Not suff. as the sum of LHS and RHS can be influenced by G,J,I and L.

Stmt. 2
F = I + L
Not suff. due to same reason as for stm. 1.

Combine
100D + 10E + F = 100G + 100J + 10h + 10K + I + L
100D + 10E + F = 100G + 100J + 10(h+k) + F
100D + 10E + F = 100(g+j) + 10E + F
Lookign at the above eq.
100D = 100(G+J)
or d = G+J.
Hence suff.

Pls. tell the OA.
User avatar
GMATaddict
Manager
Manager
Joined: 15 May 2009
Posts: 90
Own Kudos [?]: 71 [0]
Given Kudos: 3
 Q44  V44
Send PM
Re: Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink] New post   29 Jun 2009, 12:45
vcbabu wrote:
. Both a, b, and c are 3-digits integers, where a=b+c. Is the hundreds' digit of number a equal to sum of that of b and c?
1). Tens' digit of a=tens' digit of b+tens' digit of c
2). Units' digit of a=units' digit of b + units' digit of c


This is basically a problem that asks us to determine whether there were any numbers carried over from the previous units in the addition process.

1 - Not enough. We know if the tens' digits do not add up to 10, then nothing will be carried over. We know the tens' digits of B & C do not add to 10, but we don't know whether anything carried over from the addition of the units' digits, which might in turn push the sum of the tens' digits over 10.
2 - Also not enough for the same reason above. We know the addition of the units' digits won't carry over to the tens, but we don't know anything about the tens' digits.

Combined: Enough, we know neither the units nor the tens will carry over additional numbers, so the sum of the hundreds' digits will not include anything carried over.
User avatar
rashminet84
Manager
Manager
Joined: 04 Jun 2008
Posts: 111
Own Kudos [?]: 242 [0]
Given Kudos: 15
 Q49  V41
Send PM
Re: Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink] New post   29 Jun 2009, 13:05
I think ans is A

Statement 1 can only be true when there are no carry forwards from units to tens, and also from tens to hundreds. Though i have not checked out all the alternatives as it would take a lot of time, i personally feel sufficiently confident about this, and would rather have it answered wrong than waste time in attempting to check all alternatives.

If there are no carry forwards from tens to hundreds, the sum of hundreds digits of b and c will be equal to that of a.
User avatar
skpMatcha
Manager
Manager
Joined: 07 Apr 2009
Posts: 98
Own Kudos [?]: 17 [0]
Given Kudos: 3
Send PM
Re: Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink] New post   15 Jul 2009, 11:00
Quote:
1). Tens' digit of a=tens' digit of b+tens' digit of c


the only thing that I can conclude from this statement is , nothing got carried from units place...but I cant tell whether anything got carried over to the hundreds place..

281
+372
------
653 <-- here tens digit of the result is still equal to the tens digit of b and tens digit of c

one more case

231
+321
------
552 <-- here nothing is carried forward still the statement 1 holds good.

I would say the answer be E.
User avatar
rashminet84
Manager
Manager
Joined: 04 Jun 2008
Posts: 111
Own Kudos [?]: 242 [0]
Given Kudos: 15
 Q49  V41
Send PM
Re: Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink] New post   15 Jul 2009, 13:58
skpMatcha wrote:
------
653 <-- here tens digit of the result is still equal to the tens digit of b and tens digit of c



tens digit is not equal to that of b+c

8+7 = 15 and not 5; and 15 is not one single digit. So no carry forward is ensured.
User avatar
skpMatcha
Manager
Manager
Joined: 07 Apr 2009
Posts: 98
Own Kudos [?]: 17 [0]
Given Kudos: 3
Send PM
Re: Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink] New post   16 Jul 2009, 07:51
Thanks for the explanation. Looks like these notions are unique to GMAT.

like rounding to nearest number cant be recursive and only the digit next to the rounding position is rounded && and the example as this thread..

:)
User avatar
cipher
Manager
Manager
Joined: 25 Jun 2009
Posts: 132
Own Kudos [?]: 333 [0]
Given Kudos: 6
 Q49  V22 GMAT 2: 700  Q50  V35
Send PM
Re: Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink] New post   16 Jul 2009, 08:41
vcbabu wrote:
. Both a, b, and c are 3-digits integers, where a=b+c. Is the hundreds' digit of number a equal to sum of that of b and c?
1). Tens' digit of a=tens' digit of b+tens' digit of c
2). Units' digit of a=units' digit of b + units' digit of c



I also think it should be A as there is no carry forward from the tens digit. Anyway whats the OA ?

Cheers
User avatar
defoue
Intern
Intern
Joined: 30 Jun 2009
Posts: 20
Own Kudos [?]: 14 [0]
Given Kudos: 2
Send PM
Re: Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink] New post   17 Jul 2009, 06:41
Hi Guys, can someone explain why answer is "A"?
Thx in advance



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: Both a, b, and c are 3-digits integers, where a=b+c. Is the [#permalink]
17 Jul 2009, 06:41
Moderators:
Bunuel
Math Expert
92959 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts
GMATBusters
GMAT Tutor
1905 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions