BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Percentage DS

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 34
Joined: Thu Jan 08, 2009 6:24 pmFollowed by: 4 members
Thanked: 1 times
by sakurle » Fri Aug 21, 2009 6:09 pm
In a certain class 72% of male and 80% of females have applied to college. What fraction of students are male.

1. There are 840 students in the class

2. 75% of the students have applied to college
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
Senior | Next Rank: 100 Posts
Posts: 36
Joined: Sun Jun 21, 2009 12:09 pm
Thanked: 1 times
GMAT Score:700

by iamjakekim » Fri Aug 21, 2009 8:17 pm
STM1. 840 does not do anything.

SMT2.


(0.72M + 0.8F)/(M+F) = 0.75

0.72M + 0.8F = 0.75M + 0.75 F

3M = 5F

3/8 are male!! SUFFICIENT!!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 197
Joined: Sun May 18, 2008 2:47 am
Thanked: 12 times

Re: Percentage DS

by shahdevine » Fri Aug 21, 2009 8:48 pm
sakurle wrote:In a certain class 72% of male and 80% of females have applied to college. What fraction of students are male.

1. There are 840 students in the class

2. 75% of the students have applied to college
B

s1) insufficient. we don't need to know total number of students in class.

s2)

let x=total number of students
.75x=students applied therefore (.72)(.75)x=fraction of students who are male.

however, i will add caveat. this is with assumption that question is asking "what fraction of students(that applied) are male?" You may have typo. Because if that's not explicit, this might be an E. In that, there might be males that did not apply that we are not taking into account when we generate fraction.

OA plz.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 36
Joined: Sun Jun 21, 2009 12:09 pm
Thanked: 1 times
GMAT Score:700

Re: Percentage DS

by iamjakekim » Fri Aug 21, 2009 10:24 pm
shahdevine wrote: however, i will add caveat. this is with assumption that question is asking "what fraction of students(that applied) are male?" You may have typo.
wow. It makes total sense!! If answer is E, then I will have to spend more time with reading Q.

Hope its typo.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 34
Joined: Thu Jan 08, 2009 6:24 pmFollowed by: 4 members
Thanked: 1 times

by sakurle » Sat Aug 22, 2009 4:51 am
OA is B
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 73
Joined: Tue Aug 11, 2009 2:30 am
Thanked: 2 times
GMAT Score:720

by shanrizvi » Sun Aug 23, 2009 3:07 pm
When I have comparable averages or percentages (where weights influence the percentage or average), I use what I call the "number line" method. I think its quick.

Statement 1 is clearly insufficient.

72% of males applied to college, 80% of females did and 75% of all students applied to college.

M-------->A-------->F
72%--->75%--->80%

Distance between M and A = 3%
Distance between F and A = 5%


As A is closer to M, there must be more males.

M:F = 5:3

The answer is B.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 34
Joined: Thu Jan 08, 2009 6:24 pmFollowed by: 4 members
Thanked: 1 times

by sakurle » Mon Aug 24, 2009 8:51 am
Wow this is really fast, but will it work everytime? If yes then nothing like it.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1