It is currently 19 Oct 2017, 22:54

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If a, b and c are positive, is ac > 5?

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

Hide Tags

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 41884

Kudos [?]: 128932 [0], given: 12183

If a, b and c are positive, is ac > 5? [#permalink]

Show Tags

New post 14 Aug 2017, 02:02
Expert's post
2
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

58% (01:10) correct 42% (01:31) wrong based on 52 sessions

HideShow timer Statistics

Kudos [?]: 128932 [0], given: 12183

BSchool Forum Moderator
User avatar
P
Joined: 26 Feb 2016
Posts: 1454

Kudos [?]: 594 [0], given: 16

Location: India
Concentration: General Management, Leadership
WE: Sales (Retail)
Premium Member CAT Tests
If a, b and c are positive, is ac > 5? [#permalink]

Show Tags

New post 14 Aug 2017, 02:16
(1) a + b = 3
Without knowing the value of c, we cannot determine if the expression(ac) is greater than 5.
Hence, insufficient
(2) 4 = c - b
Without knowinth the value of a, we cannot determine if the expression(ac) is greater than 5.
Hence, insufficient.

On combining the information from both the statements,
b = 3 - a and b = c - 4
Therefore a + c = 7

Though the sum of a and c is 7, it is possible that the expression (ac) is greater/lesser than 5
Case 1: a = 6.2,c = 0.8. Here ac = 4.96 < 5
Case 2: a = 4, b = 3. Here ac = 12 > 5 (Insufficient)(Option E)
_________________

Stay hungry, Stay foolish

2017-2018 MBA Deadlines

Class of 2020: Rotman Thread | Schulich Thread
Class of 2019: Sauder Thread

Kudos [?]: 594 [0], given: 16

Intern
Intern
avatar
B
Joined: 15 Feb 2017
Posts: 7

Kudos [?]: 5 [0], given: 2

Location: India
Concentration: International Business, General Management
Schools: Mannheim
WE: Engineering (Other)
Re: If a, b and c are positive, is ac > 5? [#permalink]

Show Tags

New post 14 Aug 2017, 03:50
a, b, and c are positive.
Ok.

1. a + b = 3 Cant say, without knowing the value of c.

2. 4 = c - b Cant say, without knowing the value of a.

1&2. b = 3 - a, b = c - 4 which gives, a + c = 7.
Now, assume a=1, c=6, ac=6>5.
Now, assume a=0.5, c=6.5, ac=3.25<5.

Not sufficient.
Option E. :shock:

I just selected the wrong answer myself. :cry:

Kudos [?]: 5 [0], given: 2

Re: If a, b and c are positive, is ac > 5?   [#permalink] 14 Aug 2017, 03:50
Display posts from previous: Sort by

If a, b and c are positive, is ac > 5?

  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 | 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®.