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

School

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 29
Joined: Sat May 07, 2011 6:16 am
by vinayreguri » Tue Jun 21, 2011 5:20 am
In a school of 1000 students, 60% are males and rest are females, out of male students, 30% have opted for maths. if 40% of the overall students have opted for maths, what is the ratio of males to females who have not opted for maths.

A. 7:2
B. 7:3
c. 3:2
d. 1:1
e. 9:14

OA : B
Top
Join the discussion
Source: — Problem Solving |
Legendary Member
Posts: 1448
Joined: Tue May 17, 2011 9:55 amFollowed by: 53 members
Location: India
Thanked: 375 times

by Frankenstein » Tue Jun 21, 2011 5:34 am
Hi,
Males = 60%(1000) = 600
Females = 400
Males opted for Maths = 30%(600) = 180
Students opted for Maths = 40%(1000) = 400
So, females opted for maths is 400-180 = 220
Ratio of males to females who have not opted maths is (600-180) : (400-220) = 420 : 180 = 7:3

Hence, B
Cheers!

Things are not what they appear to be... nor are they otherwise
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 36
Joined: Thu May 26, 2011 7:19 am
Thanked: 3 times

by Surev » Tue Jun 21, 2011 7:18 am
For such questions, the best approach is to make a table
Maths Non-Maths Total
Male 180 (420) 600
Female (220) (180) (400)
Total 400

The figures in the above table are those that we have calculated.
Hence, the ratio of males to females not opted for maths = 420/180 = 7/3

The table is not coming nicely when I preview, but I hope you get the idea.
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 » Tue Jun 21, 2011 7:23 am
vinayreguri wrote:In a school of 1000 students, 60% are males and rest are females, out of male students, 30% have opted for maths. if 40% of the overall students have opted for maths, what is the ratio of males to females who have not opted for maths.

A. 7:2
B. 7:3
c. 3:2
d. 1:1
e. 9:14

OA : B
Since the problem asks for a ratio, we can plug in 100 for the total number of students.
Use a group grid to organize the information:
Image

Here is the grid with the following known values entered:
60% are males.
Out of the male students, 30% have opted for maths.
40% of the overall students have opted for maths.
Image

The numbers in the grid have to add up horizontally and vertically.
Fill in the missing numbers:
Image

Males who didn't opt for math : Females who didn't opt for math = 42:18 = 7:3.

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