If ab = c what is the value of bc? : GMAT Data Sufficiency (DS)
Check GMAT Club App Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

It is currently 03 Dec 2016, 11:59
GMAT Club Tests

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.

Close

Request Expert Reply

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If ab = c what is the value of bc?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Director
Director
User avatar
Joined: 07 Jun 2004
Posts: 612
Location: PA
Followers: 5

Kudos [?]: 686 [0], given: 22

If ab = c what is the value of bc? [#permalink]

Show Tags

New post 25 Jan 2011, 06:12
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

77% (01:41) correct 23% (00:07) wrong based on 22 sessions

HideShow timer Statistics

If ab = c what is the value of bc?

(1) a = 18/b^2
(2) b = 3

[Reveal] Spoiler:
i had a doubt here if S1 was rephrased as a = -18 / b^2 what would the answer be ?
[Reveal] Spoiler: OA

_________________

If the Q jogged your mind do Kudos me : )

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 35843
Followers: 6830

Kudos [?]: 89744 [0], given: 10381

Re: DS Algebra [#permalink]

Show Tags

New post 25 Jan 2011, 06:47
rxs0005 wrote:
If a*b = c what is the value of b*c

1. a = 18 / b^2
2. b = 3

i had a doubt here if S1 was rephrased as a = -18 / b^2 what would the answer be ?


If a*b = c what is the value of b*c?

(1) a = 18 / b^2 --> a*b^2=18 --> (a*b)*b=18 --> c*b=18. Sufficient.

(2) b = 3. Clearly insufficient.

Answer: A.

If statement (1) were: a=-18/b^2 then a*b^2=-18 --> (a*b)*b=-18 --> c*b=-18 (for example: a=-2, b=3). Sufficient.
_________________

New to the Math Forum?
Please read this: All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Current Student
avatar
Joined: 12 Apr 2010
Posts: 459
Location: Spain
Schools: Chicago (Booth) - Class of 2013
GMAT 1: 740 Q50 V40
WE: Information Technology (Investment Banking)
Followers: 36

Kudos [?]: 326 [0], given: 151

Reviews Badge
Re: DS Algebra [#permalink]

Show Tags

New post 26 Jan 2011, 01:35
a*b = c ==> a*b^2 = b*c (multiply by b each side)

1) a = 18/b^2 ==> a*b^2 = 18 => b*c = 18 SUFF

2) Clearly INSUFF

A
Re: DS Algebra   [#permalink] 26 Jan 2011, 01:35
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic What is the value of ab + bc ? (1) b = 5 (2) a + c = 8 Bunuel 5 06 Dec 2015, 11:06
7 Experts publish their posts in the topic What is the value of (a! + b!)(c! + d!)? Bunuel 7 05 Nov 2014, 07:43
1 Experts publish their posts in the topic If a = 3bc, what is the value of c? werbliben 11 05 Jan 2014, 05:19
10 Experts publish their posts in the topic What is the value of (a! + b!)(c! + d!)? AnkitK 12 10 May 2011, 09:09
4 Experts publish their posts in the topic For integers a, b, c, a/(b - c)=1 what is the value of (b-c) rxs0005 6 11 Feb 2011, 06:00
Display posts from previous: Sort by

If ab = c what is the value of bc?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.