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Several students are studying together for an exam - Kaplan

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Intern
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Joined: 08 Aug 2011
Posts: 21
Location: United States (CA)
Concentration: Entrepreneurship, International Business
GMAT 1: 700 Q49 V35
GPA: 3.5
WE: Business Development (Internet and New Media)
Several students are studying together for an exam - Kaplan  [#permalink]

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New post 25 Aug 2011, 21:33
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Question Stats:

62% (02:21) correct 38% (02:28) wrong based on 87 sessions

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Several students are studying together for an exam. 60% of the students who studied less than 10 hours a week feel unprepared. 80% of students who studied 10 hours or more each week feel prepared. If 75% of the students studied less than 10 hours per week, what percent of the students feel prepared for the exam?

A. 20
B. 25
C. 30
D. 35
E. 50
Intern
Intern
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Joined: 08 Aug 2011
Posts: 21
Location: United States (CA)
Concentration: Entrepreneurship, International Business
GMAT 1: 700 Q49 V35
GPA: 3.5
WE: Business Development (Internet and New Media)
Re: Several students are studying together for an exam - Kaplan  [#permalink]

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New post 25 Aug 2011, 21:46
I tackled this problem by doing this:

<10hr: Unprepped 60%
Prepped 40%
percent of total = 75%

>10hr:Unprepped 20%
Prepped 80%
% of total = 25%

total prepped% = 0.75*40+ 0.25*80 = 50%

so therefore, 50% of all students feel prepped.

in other words, lets say there are 100 students.

<10hrs = 75 (45 unprep, 30 prep)
>10hrs = 25 (5 unprep, 20 prep)

total 50 prepped, 50 unprepped.


but 50% is not an option?
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Re: Several students are studying together for an exam - Kaplan  [#permalink]

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New post 26 Aug 2011, 00:50
a1choi wrote:
...


Made the same calculation :?
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Re: Several students are studying together for an exam - Kaplan  [#permalink]

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New post 13 Sep 2011, 11:55
yeah me too got the same answer....is thr any thng wrong in the answer choices?
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Re: Several students are studying together for an exam - Kaplan  [#permalink]

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New post 13 Sep 2011, 21:06
a1choi wrote:
Several students are studying together for an exam. 60% of the students who studied less than 10 hours a week feel unprepared. 80% of students who studied 10 hours or more each week feel prepared. If 75% of the students studied less than 10 hours per week, what percent of the students feel prepared for the exam?

A. 20
B. 25
C. 30
D. 35
E. 60


The answer is missing from the options.

Let's say there are 100 students.

Students who studied <10 hrs = 75% = 75
So students who studied =>10hrs = 25

Given: 60% of the students who studied less than 10 hours a week feel unprepared.
So 40% of 75 (=30) feel prepared

Given: 80% of students who studied 10 hours or more each week feel prepared.
So 80% of 25 (= 20) feel prepared

Total (30 + 20) = 50 out of 100 feel prepared. 50% feel prepared
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Re: Several students are studying together for an exam - Kaplan  [#permalink]

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New post 15 May 2020, 23:42
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Re: Several students are studying together for an exam - Kaplan   [#permalink] 15 May 2020, 23:42

Several students are studying together for an exam - Kaplan

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