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 →

Please help.for Statement 2!

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 370
Joined: Sat Jun 11, 2011 8:50 pmFollowed by: 2 members
Location: Arlington, MA.
Thanked: 27 times
by winniethepooh » Wed Jul 06, 2011 10:50 am
In a group of 1000 people, each person is either left-handed or right-handed but not both. 80% of the females are left-handed, and 84% of the right-handed people are male. How many people are right-handed?

1) There are 600 males in the group

2) There are 180 left-handed males in the group
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
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 » Wed Jul 06, 2011 11:47 am
Hi,
I believe this a DS problem
------Female--Male--Total
Left 80x ------y ------80x+y
Right 20x ----105x----125x
-------------------------
Total 100x --105x+y---1000

From(1):
Males= 600. So, females = 400
100x = 400 =>x = 4.
Right handed = 125x = 500
Sufficient
From(2):
y=180
But, 205x+y = 1000
So, 205x + 180 = 1000 => x=4
Right handed = 125x = 500
Sufficient

Hence, D
Cheers!

Things are not what they appear to be... nor are they otherwise
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 407
Joined: Tue Jan 25, 2011 9:19 amFollowed by: 7 members
Thanked: 25 times

by Ozlemg » Wed Jul 06, 2011 11:57 am
Hey Frank you are faster than me! :))

I totally agree that the answer is D
The more you suffer before the test, the less you will do so in the test! :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
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 » Wed Jul 06, 2011 1:23 pm
winniethepooh wrote:In a group of 1000 people, each person is either left-handed or right-handed but not both. 80% of the females are left-handed, and 84% of the right-handed people are male. How many people are right-handed?

1) There are 600 males in the group

2) There are 180 left-handed males in the group
Use a group grid to organize the data:

Image

The grid shows that .16R = .2F, implying that R = (5/4)F.

Statement 1: M=600.
Thus, F = 400 and R = (5/4)*400 = 500.
Sufficient.

Statement 2: Left males = 180.
If the correct answer is D, then statement 2 must confirm the information given in statement 1: M=600, F=400, and R=500.
Along with Left Males = 180, plug into the grid M=600, F=400, and R=500 and fill in the missing values:

Image

The grid above reflects the only combination of values that will satisfy all the conditions given.
If M≠600, F≠400, and R≠500, then the values in the grid will change, and the conditions given in the problem won't be satisfied.
Thus, like statement 1, statement 2 indicates that R=500.
Sufficient.

The correct answer is D.
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
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 370
Joined: Sat Jun 11, 2011 8:50 pmFollowed by: 2 members
Location: Arlington, MA.
Thanked: 27 times

by winniethepooh » Wed Jul 06, 2011 3:33 pm
Thanks for your explanation Mitch!
Just a small doubt:
If in a DS question, I find that statement 1 is sufficient and statement 2 provides an information I found through statement 1 then do I consider statement 2 to be sufficient too?

Ditto as in this problem?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
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 » Wed Jul 06, 2011 4:15 pm
winniethepooh wrote:Thanks for your explanation Mitch!
Just a small doubt:
If in a DS question, I find that statement 1 is sufficient and statement 2 provides an information I found through statement 1 then do I consider statement 2 to be sufficient too?

Ditto as in this problem?
Be careful.
If a DS question asks for the value of x, and statement 1 gives sufficient information to determine that x=5, then x=5 must also satisfy statement 2.
This does not mean that x=5 is the only value that satisfies statement 2.
To deem statement 2 sufficient, we must be sure that no other value satisfies statement 2.

In the DS question above, the value of R determines all the other values in the grid.
Follow the pathways:
Image

Since R=500 implies that Left Male = 180, and the value of Left Male depends on the value of R, we know that no other value but R=500 will satisfy statement 2.
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
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 142
Joined: Mon Jan 10, 2011 8:03 am
Thanked: 19 times

by krishnasty » Wed Jul 06, 2011 10:39 pm
Frankenstein wrote:Hi,
I believe this a DS problem
------Female--Male--Total
Left 80x ------y ------80x+y
Right 20x ----105x----125x
-------------------------
Total 100x --105x+y---1000

From(1):
Males= 600. So, females = 400
100x = 400 =>x = 4.
Right handed = 125x = 500
Sufficient
From(2):
y=180
But, 205x+y = 1000
So, 205x + 180 = 1000 => x=4
Right handed = 125x = 500
Sufficient

Hence, D
can you please explain me how were you able to arrive at the above bold part?
---------------------------------------
Appreciation in thanks please!!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1448
Joined: Tue May 17, 2011 9:55 amFollowed by: 53 members
Location: India
Thanked: 375 times

by Frankenstein » Wed Jul 06, 2011 10:58 pm
krishnasty wrote:
Frankenstein wrote:Hi,
I believe this a DS problem
------Female--Male--Total
Left 80x ------y ------80x+y
Right 20x ----105x----125x
-------------------------
Total 100x --105x+y---1000

From(1):
Males= 600. So, females = 400
100x = 400 =>x = 4.
Right handed = 125x = 500
Sufficient
From(2):
y=180
But, 205x+y = 1000
So, 205x + 180 = 1000 => x=4
Right handed = 125x = 500
Sufficient

Hence, D
can you please explain me how were you able to arrive at the above bold part?
Hi,
84% of the right-handed people are male.
So, 16% of the right-handed are female
So, 20x is 16% of right handed
So, right-handed is (20x)(100/16) = 125x
right handed male = 125x - 20x = 105x
Cheers!

Things are not what they appear to be... nor are they otherwise
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 461
Joined: Tue May 10, 2011 9:09 amFollowed by: 3 members
Location: pune
Thanked: 36 times

by amit2k9 » Thu Jul 07, 2011 12:46 am
using the matrix method --

------ L-------R
M-------------0.84r----1000-f

F-----0.8f----0.2f------f

-----1000-r----r-------1000

thus 0.2f=0.16r
f/r=4/5. f=females r= right handed people.

a provides f=400 thus r=500.

b provides 1000-r = 0.8f + 180
thus r = 500.

hence D it is.
For Understanding Sustainability,Green Businesses and Social Entrepreneurship visit -https://aamthoughts.blocked/
(Featured Best Green Site Worldwide-https://bloggers.com/green/popular/page2)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 5
Joined: Fri Jun 17, 2011 11:02 pm

by shimmer » Sun Aug 14, 2011 11:04 am
Hi,

This is a question based on Mitch's reply.

Considering we solved statement 2 with all of the information we got from working on statement 1, why is the correct answer option not C?

Unless there's a way to solve this problem with the information provided in Statement 2 alone. If yes, can you elaborate in that process?

Please let me know if I'm missing something.

Thanks!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 2789
Joined: Tue Jul 26, 2011 12:19 amFollowed by: 43 members
Location: Chennai, India
Thanked: 206 times
GMAT Score:640

by GmatKiss » Sun Aug 14, 2011 11:46 am
IMO:D

Given,

% of female left and % of male left
Inferred: % of female right and % of make right

1) Total no of male. From this we can calculate one by one in the order as follows,

Male left, Male right, Total Male, Total Female, Female left, female right.
[spoiler]Sufficient!!![/spoiler]

2) No. of male left in the group. From this we can calculate one by one in the order as follows,

Male Right, total male , total female, female right, female left.
[spoiler]Sufficient!!![/spoiler]
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 7
Joined: Sun Oct 30, 2011 10:22 am

by prepp » Wed Nov 28, 2012 8:06 pm
Thanks for the explanation Mitch.
Usually, the approach for DS is that we evaluate each statement independently.

Please can you explain solving this question just by evaluating the q stem with statement 2?

Thanks a lot!

GMATGuruNY wrote:
winniethepooh wrote:In a group of 1000 people, each person is either left-handed or right-handed but not both. 80% of the females are left-handed, and 84% of the right-handed people are male. How many people are right-handed?

1) There are 600 males in the group

2) There are 180 left-handed males in the group
Use a group grid to organize the data:

Image

The grid shows that .16R = .2F, implying that R = (5/4)F.

Statement 1: M=600.
Thus, F = 400 and R = (5/4)*400 = 500.
Sufficient.

Statement 2: Left males = 180.
If the correct answer is D, then statement 2 must confirm the information given in statement 1: M=600, F=400, and R=500.
Along with Left Males = 180, plug into the grid M=600, F=400, and R=500 and fill in the missing values:

Image

The grid above reflects the only combination of values that will satisfy all the conditions given.
If M≠600, F≠400, and R≠500, then the values in the grid will change, and the conditions given in the problem won't be satisfied.
Thus, like statement 1, statement 2 indicates that R=500.
Sufficient.

The correct answer is D.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
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 » Thu Nov 29, 2012 4:38 am
prepp wrote:Thanks for the explanation Mitch.
Usually, the approach for DS is that we evaluate each statement independently.

Please can you explain solving this question just by evaluating the q stem with statement 2?

Thanks a lot!
In a group of 1000 people, each person is either left-handed or right-handed but not both. 80% of the females are left-handed, and 84% of the right-handed people are male. How many people are right-handed?

1) There are 600 males in the group

2) There are 180 left-handed males in the group

This is an EITHER/OR group question.
Every person is EITHER male OR female.
Every person is either LEFT-HANDED or RIGHT-HANDED.
For an EITHER/OR group problem, use a GROUP GRID to organize the data.
Put all of the information in terms of ONE VARIABLE.

From the question stem:
Total people = 1000.
Let total females = 100f.
Since 80% of the females are left-handed, left-handed females = 80f and right-handed females = 20f.
Here's the grid so far:
_______________M________F_______Total

L:______________________80f

R:______________________20f________

total:__________________100f______1000

Since 84% of the right-handed people are male, right-handed females -- 20f in the grid above -- account for 16% of the total number of right-handed people:
20f = .16(total right-handed)
Total right-handed = 20f/.16 = 2000f/16 = 125f.
Completing the middle row of the grid, we get:
_______________M________F_______Total

L:______________________80f

R:____________105f______20f_______125f

total:__________________100f______1000

Statement 2: There are 180 left-handed males in the group.
Inserting this information into the grid, we get:
_______________M________F_______Total

L:____________ 180______80f_____180+80f

R:____________105f______20f_______125f

total:__________________100f______1000
The rightmost column implies the following:
(180+80f) + 125f = 1000.
205f = 820
f=4.
Thus, total right-handed = 125f = 125*4 = 500.
SUFFICIENT.
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
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1