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

It is currently 22 Oct 2018, 18:05

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 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

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50042
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
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

72% (00:56) correct 28% (01:34) wrong based on 172 sessions

HideShow timer Statistics

CEO
CEO
User avatar
D
Joined: 12 Sep 2015
Posts: 3031
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
2
Top Contributor
1
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:

RELATED VIDEO

_________________

Brent Hanneson – GMATPrepNow.com
Image
Sign up for our free Question of the Day emails

Retired Moderator
avatar
G
Joined: 26 Nov 2012
Posts: 593
Premium Member
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
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..
VP
VP
User avatar
P
Joined: 05 Mar 2015
Posts: 1000
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
Target Test Prep Representative
User avatar
P
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 3906
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
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

Intern
Intern
avatar
B
Joined: 06 Apr 2016
Posts: 26
GMAT 1: 720 Q49 V40
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.
GMAT Club Bot
Re: If 8a = 9b and ab ≠0, what is the ratio of a/9 to b/8? &nbs [#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  


Copyright

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®.