GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 14 Aug 2018, 20:09

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

Confirm Cancel

If 2 + 5a b/2 = 3c, what is the value of b?

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

Hide Tags

Senior Manager
Senior Manager
User avatar
Joined: 06 Jul 2006
Posts: 278
Location: SFO Bay Area
Schools: Berkeley Haas
If 2 + 5a b/2 = 3c, what is the value of b?  [#permalink]

Show Tags

New post 17 Feb 2008, 13:08
2
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

69% (01:08) correct 31% (01:18) wrong based on 309 sessions

HideShow timer Statistics

If 2 + 5a – b/2 = 3c, what is the value of b?

(1) a + c = 13

(2) -12c = -20a + 4
Senior Manager
Senior Manager
User avatar
Joined: 20 Dec 2004
Posts: 250
Re: If 2 + 5a b/2 = 3c, what is the value of b?  [#permalink]

Show Tags

New post 17 Feb 2008, 13:16
B.


2 + 5a - 3c = b/2 => 4 + 10a - 6c = b => 4 + 2 (5a - 3c) = b

From 1) a + c = 13. Substituting a in above will not give b by itself. INSUFF

From 2) -12c = -20a + 4 => 5a - 3c = 1. Substituting this above will give 4 + 2 = 6.

b = 6

OA ?
_________________

Stay Hungry, Stay Foolish

VP
VP
avatar
Joined: 28 Dec 2005
Posts: 1477
Re: If 2 + 5a b/2 = 3c, what is the value of b?  [#permalink]

Show Tags

New post 17 Feb 2008, 15:41
B

Stat 1 leaves you with an answer that still has one variable. Insuff.

Stat 2 gives you that 6c=10a-2 , and from stem you know that b=6c-4-10a. Suff.
Manager
Manager
User avatar
Joined: 22 Feb 2009
Posts: 189
GMAT ToolKit User
Re: If 2 + 5a b/2 = 3c, what is the value of b?  [#permalink]

Show Tags

New post 16 Jul 2014, 15:50
1
2 + 5a - b/2 = 3c, what is the value of b

From the equation, we have: (x2 both sides) 4 + 10a - b = 6c, so b = 4 + 10a - 6c
From (1): a + c = 13 is not sufficient since there is two options : b = f(a) or b = f(c) after replace a or c to the main equation

from (2): -12c = -20a + 4. (/4 both sides), we have -3c = -5a + 1, then we have ( x2 both sides): -6c = -10a + 2, or 10a - 6c = 2, so b = 4 + 2 = 6.

Answer: B
_________________

.........................................................................
+1 Kudos please, if you like my post

Director
Director
avatar
S
Joined: 12 Nov 2016
Posts: 772
Location: United States
Schools: Yale '18
GMAT 1: 650 Q43 V37
GRE 1: Q157 V158
GPA: 2.66
Re: If 2 + 5a b/2 = 3c, what is the value of b?  [#permalink]

Show Tags

New post 08 Sep 2017, 22:47
suntaurian wrote:
If 2 + 5a – b/2 = 3c, what is the value of b?

(1) a + c = 13

(2) -12c = -20a + 4


St 1

cannot cancel out variables insuff

St 2

Hidden in here is

5a- 1 - in whichc case we can cancel out

B
Re: If 2 + 5a b/2 = 3c, what is the value of b? &nbs [#permalink] 08 Sep 2017, 22:47
Display posts from previous: Sort by

If 2 + 5a b/2 = 3c, what is the value of b?

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

Events & Promotions

PREV
NEXT


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

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.