It is currently 10 Dec 2017, 20:53

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 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8?

  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: 42529

Kudos [?]: 135171 [0], given: 12664

If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8? [#permalink]

Show Tags

New post 01 Aug 2016, 05:57
Expert's post
6
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

74% (00:41) correct 26% (01:05) wrong based on 139 sessions

HideShow timer Statistics

Kudos [?]: 135171 [0], given: 12664

Expert Post
Top Contributor
1 KUDOS received
SVP
SVP
User avatar
G
Joined: 12 Sep 2015
Posts: 1898

Kudos [?]: 2731 [1], given: 362

Location: Canada
Re: If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8? [#permalink]

Show Tags

New post 01 Aug 2016, 06:34
1
This post received
KUDOS
Expert's post
Top Contributor
2
This post was
BOOKMARKED
Bunuel wrote:
If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8?

A. 64/81
B. 8/9
C. 1
D. 9/8
E. 81/64


A nice fast approach is the first find a pair of numbers that satisfy the given equation: 8a = 9b
Here's one pair: a = 9 and b = 8

What is the ratio of a/9 to b/8?
In other words, what is the value of (a/9)/(b/8)?
Plug in values to get: (a/9)/(b/8) = (9/9)/(8/8)
= 1/1
= 1

Answer:
[Reveal] Spoiler:
C


RELATED VIDEO

_________________

Brent Hanneson – Founder of gmatprepnow.com

Image

Kudos [?]: 2731 [1], given: 362

1 KUDOS received
Retired Moderator
avatar
G
Joined: 26 Nov 2012
Posts: 594

Kudos [?]: 179 [1], given: 45

Premium Member CAT Tests
Re: If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8? [#permalink]

Show Tags

New post 01 Aug 2016, 07:18
1
This post received
KUDOS
Bunuel wrote:
If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8?

A. 64/81
B. 8/9
C. 1
D. 9/8
E. 81/64



8a = 9b then a = 9b / 8.

Need to find the ratio..a/9 to b/8 => 8a/9b..

Sub a value in 8a/9b => 8 * 9b / 8 * 9b = 1.

IMO C is correct answer..

OA please..will correct if I missed anything..

Kudos [?]: 179 [1], given: 45

Director
Director
User avatar
P
Joined: 05 Mar 2015
Posts: 966

Kudos [?]: 301 [0], given: 41

If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8? [#permalink]

Show Tags

New post 01 Aug 2016, 07:46
Bunuel wrote:
If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8?

A. 64/81
B. 8/9
C. 1
D. 9/8
E. 81/64

if ab ≠0
then a and b has two integer sets of pair
if a=9 then b=8
and if a=-9 then b=-8
also in fraction if a=1/8 then b=1/9
any of the pair we check the ratio 8a/9b=1
Ans C

Kudos [?]: 301 [0], given: 41

Expert Post
1 KUDOS received
Target Test Prep Representative
User avatar
S
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 1921

Kudos [?]: 1010 [1], given: 3

Location: United States (CA)
Re: If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8? [#permalink]

Show Tags

New post 05 Oct 2017, 10:19
1
This post received
KUDOS
Expert's post
1
This post was
BOOKMARKED
Bunuel wrote:
If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8?

A. 64/81
B. 8/9
C. 1
D. 9/8
E. 81/64


We are given that 8a = 9b. If we divide both sides by 72, we have:

8a/72 = 9b/72

a/9 = b/8

Since a/9 = b/8, the ratio between the two quantities is 1/1 = 1.

Answer: C
_________________

Scott Woodbury-Stewart
Founder and CEO

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

Kudos [?]: 1010 [1], given: 3

Intern
Intern
avatar
B
Joined: 06 Apr 2016
Posts: 18

Kudos [?]: 3 [0], given: 68

CAT Tests
Re: If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8? [#permalink]

Show Tags

New post 06 Oct 2017, 23:21
Bunuel wrote:
If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8?

A. 64/81
B. 8/9
C. 1
D. 9/8
E. 81/64


Since 8a=9b

Now if you divide both sides by 8 and 9, we get

a/9=b/8

Hence the ratio of a/9 and b/8 will be equal to 1.

Ans C.

Kudos [?]: 3 [0], given: 68

Re: If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8?   [#permalink] 06 Oct 2017, 23:21
Display posts from previous: Sort by

If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8?

  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®.