Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 563 reviewsTarget Test Prep

GMAT Avengers Study Group Practice Question - Ratio

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 11
Joined: Sun Jul 08, 2012 12:54 pmFollowed by: 3 members
Thanked: 2 times
by helen.xia@mbawatch » Sun Sep 22, 2013 9:42 am
FOR GMAT AVENGERS STUDY GROUP PARTICIPANTS - NO EXPERT REPLIES NEEDED

If ½ of the number of white mice in a certain laboratory is 1/8 of the total number of mice, and 1/3 of the number of gray mice is 1/9 of the total number of mice, then what is the ratio of the number of white mice to the number of gray mice?

a) 2:3
b) 3:4
c) 4:5
d) 8:9
e) 16:27
Last edited by helen.xia@mbawatch on Sun Sep 22, 2013 9:54 am, edited 1 time in total.
Top
Join the discussion
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 1555
Joined: Tue Aug 14, 2012 11:18 pmFollowed by: 34 members
Thanked: 448 times
GMAT Score:650

by theCodeToGMAT » Sun Sep 22, 2013 9:51 am
N = Total number of mice
W = White Mice
G = Gray mice

1/2 W = 1/8 N
N = 4 W

1/3 G = 1/9 N
N = 3 G

W/G = (N/4)/(N/3) = 3/4

Are you sure of the Answer choices????

I guess you mistakenly wrote {B} as 2:4 rather than 3:4... as 2:4 should have been written 1:2
R A H U L
Top
Join the discussion
Junior | Next Rank: 30 Posts
Posts: 11
Joined: Sun Jul 08, 2012 12:54 pmFollowed by: 3 members
Thanked: 2 times

by helen.xia@mbawatch » Sun Sep 22, 2013 10:00 am
Thank you theCodeToGMAT for spotting the error!
Top
Join the discussion
User avatar
GMAT Instructor
Posts: 15539
Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members
Location: New York, NY
Thanked: 13060 times
GMAT Score:790

by GMATGuruNY » Sun Sep 22, 2013 10:12 am
helen.xia@mbawatch wrote:If ½ of the number of white mice in a certain laboratory is 1/8 of the total number of mice, and 1/3 of the number of gray mice is 1/9 of the total number of mice, then what is the ratio of the number of white mice to the number of gray mice?

a) 2:3
b) 3:4
c) 4:5
d) 8:9
e) 16:27
Let the total number of mice = the LCM of 8 and 9 = 72.

½ of the number of white mice in a certain laboratory is 1/8 of the total number of mice.
Since 1/8 * 72 = 9, and this value is 1/2 the number of white mice, the number of white mice = 18.

1/3 of the number of gray mice is 1/9 of the total number of mice.
Since 1/9 * 72 = 8, and this value is 1/3 the number of gray mice, the number of gray mice = 24.

Thus:
white mice : gray mice = 18:24 = 3:4.

The correct answer is B.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.

As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.

For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 283
Joined: Sun Jun 23, 2013 11:56 pmFollowed by: 26 members
Location: Bangalore, India
Thanked: 97 times
GMAT Score:750

by ganeshrkamath » Tue Sep 24, 2013 1:07 am
helen.xia@mbawatch wrote:FOR GMAT AVENGERS STUDY GROUP PARTICIPANTS - NO EXPERT REPLIES NEEDED

If ½ of the number of white mice in a certain laboratory is 1/8 of the total number of mice, and 1/3 of the number of gray mice is 1/9 of the total number of mice, then what is the ratio of the number of white mice to the number of gray mice?

a) 2:3
b) 3:4
c) 4:5
d) 8:9
e) 16:27
W/2 = T/8 => W = T/4
G/3 = T/9 => G = T/3

W/G = (T/4)/(T/3) = 3/4

Choose b

Cheers
Every job is a self-portrait of the person who did it. Autograph your work with excellence.

Kelley School of Business (Class of 2016)
GMAT Score: 750 V40 Q51 AWA 5 IR 8
https://www.beatthegmat.com/first-attemp ... tml#688494
Top
Join the discussion