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 →

DS Problem Set 01

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 54
Joined: Tue Feb 02, 2010 5:17 am
Thanked: 2 times
by gdk800 » Wed Dec 08, 2010 7:54 am
Q1. Are x and y both positive?
a. 2x - 2y = 1
b. x�y > 1

OA is C

Q2. Of 1400 college teachers surveyed, 42% said they considered research essential. How many teachers surveyed were women?
a. In survey 36% of men and 50% of women said they considered research essential
b. 288 men said they considered research essential
[spoiler]
Here the OA is A[/spoiler]. But why can't it be D as with the info given 42% teachers (588) considered research essential. In option B, its given that 288 men said they considered research essential, the remaining has to be women i.e. 300.
Moreover it is the same answer we get when we solve A. Please clarify.

Q3. If x is a positive number less than 10, is z greater than average of x and 10?
a. z is closer to 10 than x on the number line
b. z = 5x

OA says A. But my question is if I plug in different values of x & z, I get different answers.
Example: for X =2 & Z = 8, Z is greater than Average of X & 10 but for
X = 2 and Z = 3, Z is not greater than average of X & 10. Different answers for different values, thus it can't be A.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 1179
Joined: Sun Apr 11, 2010 9:07 pmFollowed by: 88 members
Location: Milpitas, CA
Thanked: 447 times

by Rahul@gurome » Wed Dec 08, 2010 8:35 am
gdk800 wrote:Q1. Are x and y both positive?
a. 2x - 2y = 1
b. x�y > 1
A detail discussion is available here: https://www.beatthegmat.com/are-x-and-y- ... tml#319368
Rahul Lakhani
Quant Expert
Gurome, Inc.
https://www.GuroMe.com
On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 1179
Joined: Sun Apr 11, 2010 9:07 pmFollowed by: 88 members
Location: Milpitas, CA
Thanked: 447 times

by Rahul@gurome » Wed Dec 08, 2010 8:45 am
gdk800 wrote:Q2. Of 1400 college teachers surveyed, 42% said they considered research essential. How many teachers surveyed were women?
a. In survey 36% of men and 50% of women said they considered research essential
b. 288 men said they considered research essential
Given: Say, number of men = M and number of women = W => (M + W) = 1400
42% of 1400 = 588 said they considered research essential

Statement 1: 36% of men and 50% of women said they considered research essential
=> (0.36M + 0.50M) = 588

We have two equations in two unknown. We can solve for W.

Sufficient.

Statement 2: 288 men said they considered research essential
Therefore (588 - 288) = 300 Women said they considered research essential. But this doesn't tells us about total number of women teachers that were surveyed.

Not sufficient

Correct answer is A.
gdk800 wrote:But why can't it be D as with the info given 42% teachers (588) considered research essential. In option B, its given that 288 men said they considered research essential, the remaining has to be women i.e. 300.
Moreover it is the same answer we get when we solve A. Please clarify.
The question asks for total number of women teachers not how many women teachers said they considered research essentials. There may be some women who didn't say so.
Rahul Lakhani
Quant Expert
Gurome, Inc.
https://www.GuroMe.com
On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 1179
Joined: Sun Apr 11, 2010 9:07 pmFollowed by: 88 members
Location: Milpitas, CA
Thanked: 447 times

by Rahul@gurome » Wed Dec 08, 2010 8:52 am
gdk800 wrote:Q3. If x is a positive number less than 10, is z greater than average of x and 10?
a. z is closer to 10 than x on the number line
b. z = 5x

OA says A. But my question is if I plug in different values of x & z, I get different answers.
Example: for X =2 & Z = 8, Z is greater than Average of X & 10 but for
X = 2 and Z = 3, Z is not greater than average of X & 10. Different answers for different values, thus it can't be A.
While considering statement 1, you simply can't assume z = 3 for x = 2! Statement 1 says "z is closer to 10 than x on the number line", which means z must be greater than [x + (10 - x)/2]. For x = 2, z must be greater than 6.
Rahul Lakhani
Quant Expert
Gurome, Inc.
https://www.GuroMe.com
On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 165
Joined: Wed Mar 24, 2010 8:02 amFollowed by: 1 member
Thanked: 2 times

by HPengineer » Thu Dec 09, 2010 11:58 am
So for question three what is the official answer? A?

Cheers

M
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1