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

Redeem

percent

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 965
Joined: Thu Jan 28, 2010 12:52 am
Thanked: 156 times
Followed by:34 members
GMAT Score:720

by vineeshp » Fri Aug 26, 2011 6:43 am
Students who studied < 10 = 75%
Students who studied <= 10 = 25 %

60% of 75% feel unprepared + 80% of 25% feel unprepared.
45% + 20% = 65 % feel unprepared

Hence 35 % feel prepared.

(If the percentages is confusing you assume that there were totally 100 students.)
Vineesh,
Just telling you what I know and think. I am not the expert. :)
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 312
Joined: Tue Aug 02, 2011 3:16 pm
Location: New York City
Thanked: 130 times
Followed by:33 members
GMAT Score:780

by gmatboost » Fri Aug 26, 2011 8:23 am
It's also amusing to notice that since 65% is one of the answer choices and is unlike the others, so it is there for a reason. In this case it is a trap answer, since 65% is the percent that feels unprepared. So you could tell from the start the answer would be 35%.

Test prep companies love to do stuff like that but the GMAT would never make it as obvious, because a question like that likely wouldn't show proper "validity" or whatever the term is that means that people who are doing well in general are also doing well on this specific question.
Greg Michnikov, Founder of GMAT Boost

GMAT Boost offers 250+ challenging GMAT Math practice questions, each with a thorough video explanation, and 100+ GMAT Math video tips, each 90 seconds or less.
It's a total of 20+ hours of expert instruction for an introductory price of just $10.
View sample questions and tips without signing up, or sign up now for full access.

Also, check out the most useful GMAT Math blog on the internet here.
Top
Senior | Next Rank: 100 Posts
Posts: 40
Joined: Mon Oct 18, 2010 8:32 am

by eshwarjayanth » Fri Aug 26, 2011 8:57 am
vineeshp wrote:Students who studied < 10 = 75%
Students who studied <= 10 = 25 %

60% of 75% feel unprepared + 80% of 25% feel unprepared.
45% + 20% = 65 % feel unprepared

Hence 35 % feel prepared.

(If the percentages is confusing you assume that there were totally 100 students.)

Can u plz explain this part 80% of 25% feel unprepared.

We are given 80% of students who studied 10 hours or more each week feel prepared.
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 312
Joined: Tue Aug 02, 2011 3:16 pm
Location: New York City
Thanked: 130 times
Followed by:33 members
GMAT Score:780

by gmatboost » Fri Aug 26, 2011 9:55 am
You're right, I also misread it.

Prepared should be 75% * 40% + 25% * 80% = 30% + 20% = 50%...
Greg Michnikov, Founder of GMAT Boost

GMAT Boost offers 250+ challenging GMAT Math practice questions, each with a thorough video explanation, and 100+ GMAT Math video tips, each 90 seconds or less.
It's a total of 20+ hours of expert instruction for an introductory price of just $10.
View sample questions and tips without signing up, or sign up now for full access.

Also, check out the most useful GMAT Math blog on the internet here.
Top
User avatar
Senior | Next Rank: 100 Posts
Posts: 64
Joined: Sun Jul 24, 2011 9:11 am
Thanked: 13 times
GMAT Score:610

by sumgb » Fri Aug 26, 2011 2:34 pm
Good. Then I was not the only one getting 50% :-) I'm glad...
Thanks.
Top
User avatar
Legendary Member
Posts: 965
Joined: Thu Jan 28, 2010 12:52 am
Thanked: 156 times
Followed by:34 members
GMAT Score:720

by vineeshp » Fri Aug 26, 2011 6:04 pm
Sorry, my bad. I took both as unprepared.

But hope you understood the solution.
Vineesh,
Just telling you what I know and think. I am not the expert. :)
Top
Master | Next Rank: 500 Posts
Posts: 370
Joined: Sat Jun 11, 2011 8:50 pm
Location: Arlington, MA.
Thanked: 27 times
Followed by:2 members

by winniethepooh » Sat Aug 27, 2011 6:11 am
If the answer is 50% of the students feel prepared, then there's a reason to worry.
That's not an option!
Somebody explain please.
Top
User avatar
Legendary Member
Posts: 540
Joined: Sat Dec 20, 2008 7:24 pm
Thanked: 37 times
Followed by:6 members

by navami » Tue Aug 30, 2011 7:13 am
ans is either 50% if we consider that rest 40% of the students who study less than 10 hours a week are prepared.

Else we can only consider the 25 students who study >= 10 hours a week and consider 80% 0f 25 = 20
This time no looking back!!!
Navami
Top
Post new topic Post Reply
• Page 1 of 1