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 →

Time

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 23
Joined: Wed Oct 19, 2011 7:12 pm
by silverflamein » Tue Nov 08, 2011 6:34 pm
Can 3 men and 7 women finish a certain piece of work in 15 days???

1) 2men and 4 women can finish the work in 10 days

2) each of the women can do twice the work that each of the men can do in a given time.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
Posts: 385
Joined: Fri Sep 23, 2011 9:02 pmFollowed by: 6 members
Thanked: 62 times

by user123321 » Tue Nov 08, 2011 7:04 pm
1) if 2M & 4W can finish the work in 10 days,
then 3M & 7W can finish the work in even less than 10 days. hence sufficient.
2) since we dont know how much work an individual man can do in a day, it is insufficient.

[spoiler]is it A?[/spoiler]

user123321
Just started my preparation :D
Want to do it right the first time.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1084
Joined: Fri Apr 15, 2011 2:33 pmFollowed by: 21 members
Thanked: 158 times

by pemdas » Tue Nov 08, 2011 7:20 pm
st(1) (2m+4w)/10 OR (m+2w)/5 is one day's work. 15 days work will be 3m+6w Sufficient to conclude that 3 men and 7 women can finish up the required work with one less woman, answer Yes.

st(2) w=2m this is Not Sufficient, as we are not suggested which time (day, week ...)

a
silverflamein wrote:Can 3 men and 7 women finish a certain piece of work in 15 days???

1) 2men and 4 women can finish the work in 10 days

2) each of the women can do twice the work that each of the men can do in a given time.
Last edited by pemdas on Fri Nov 11, 2011 5:01 am, edited 1 time in total.
Success doesn't come overnight!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 8
Joined: Thu Oct 06, 2011 4:47 amFollowed by: 1 member

by batmannavneet » Wed Nov 09, 2011 9:56 am
I think the answer is A.
I don't quite understand the calculation of statement 2 below.
pemdas wrote:the question tests average speed: Can it be that 1/3m (throughput of one men for one job is 1/3 of whole unit) and 1/7w (throughput of one women for one job is 1/7 of whole unit) *multiplied* by time, 15 days be enough to complete one job?

st(1) 10*(1/2m+1/4w)=1 means 10 hours is enough to complete one job with the given throughputs, and if we match 10(2+1)/4mw=1, 30=4mw we see that men and women can be only integer and not fractions
out of possible values for m*w (15=2mw). The question asked was: 15(1/3m+1/7w)=1? and can answer No since 15(7+3)=21mw and 50=7mw is not equivalent to 15=2mw, 50/15 =! 7/2 <> 3 1/3 =! 3 1/2 Sufficient

st(2) w=2m although we are not given day-people function, we can find whether 15(1/m + 1/2m)=1 to test 50=7mw; 15*3=2m and m=45/2, w=45. The question asked was 50=7mw and f we plug in m and w we get 50=! 7*(45/2)*45. We can answer No, Sufficient
d
silverflamein wrote:Can 3 men and 7 women finish a certain piece of work in 15 days???

1) 2men and 4 women can finish the work in 10 days

2) each of the women can do twice the work that each of the men can do in a given time.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 105
Joined: Sun Jan 25, 2009 6:55 pmFollowed by: 1 member
Thanked: 2 times

by bpdulog » Wed Nov 09, 2011 10:21 am
I think the answer is C.

With A, you still have 2 unknowns. I think it be okay if the same amount of men and women were added, but in this case it is not.
NO EXCUSES

"Winston tastes good like a cigarette should."
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 588
Joined: Sun Oct 16, 2011 9:42 amFollowed by: 9 members
Location: New Delhi, India
Thanked: 130 times
GMAT Score:720

by rijul007 » Wed Nov 09, 2011 10:23 am
Statement 1
Let the rate at wich men do their work be m and that for women be w.

2m +4w = 10

Multiplying both sides of the equation by 3/2

3m + 6w = 15

Hence addition of one more woman would only reduce the number of days..

Sufficient

Statement 2
w = 2m

Total rate at which they do their work => 3m + 7w => 17m


We dont know the value of m or about the amount of work

Hence, Insufficient

Option A
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 608
Joined: Sun Jun 19, 2011 11:16 amFollowed by: 8 members
Thanked: 37 times

by saketk » Wed Nov 09, 2011 11:08 am
bpdulog wrote:I think the answer is C.

With A, you still have 2 unknowns. I think it be okay if the same amount of men and women were added, but in this case it is not.
You don't need to solve this question at all. you can answer this by using common sense.

It is logical to say that when less people can do the job in 10 days then more people will Definitely take lesser time to do the same job.

Answer should be A
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 416
Joined: Tue Aug 30, 2011 2:18 pmFollowed by: 9 members
Location: Delhi, India
Thanked: 13 times

by vaibhavgupta » Thu Nov 10, 2011 5:57 pm
silverflamein wrote:Can 3 men and 7 women finish a certain piece of work in 15 days???

1) 2men and 4 women can finish the work in 10 days

2) each of the women can do twice the work that each of the men can do in a given time.
I went for C

could somebody pls tell OA?
:?
If OA is A, IMO B
If OA is B, IMO C
If OA is C, IMO D
If OA is D, IMO E
If OA is E, IMO A

FML!! :/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1084
Joined: Fri Apr 15, 2011 2:33 pmFollowed by: 21 members
Thanked: 158 times

by pemdas » Fri Nov 11, 2011 5:02 am
just revised/reread q.
closer to @rijul007 in solution and it's A
Success doesn't come overnight!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1