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A student's grade in a college course is determined by the scores of 5

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Intern
Joined: 08 Feb 2015
Posts: 3
A student's grade in a college course is determined by the scores of 5  [#permalink]

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20 Jan 2017, 08:00
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55% (hard)

Question Stats:

66% (02:58) correct 34% (02:53) wrong based on 59 sessions

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A student's grade in a college course is determined by the scores of 5 quizzes, a midterm exam and a final exam. The midterm exam and the final exam both count twice as much as a quiz in determining the student's average grade. If the student averages a score of 80 on the quizzes and scored a 90 on the midterm exam, then what would the student have to score on the final exam to have an overall average grade of 85 for the entire course?

A - 85.5
B - 90
C - 92.5
D - 93.5
E - 95
Intern
Joined: 03 Sep 2016
Posts: 14
Re: A student's grade in a college course is determined by the scores of 5  [#permalink]

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20 Jan 2017, 09:27
1
1
5/9*80+2/9*90+2/9*x = 85 (mid term n final both count twice as much as a quiz)
Ans: 92.5

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Concentration: General Management, Entrepreneurship
WE: General Management (Energy and Utilities)
Re: A student's grade in a college course is determined by the scores of 5  [#permalink]

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20 Jan 2017, 10:30
5/9*80+2/9*90+2/9*x = 85
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Joined: 27 May 2012
Posts: 1027
Re: A student's grade in a college course is determined by the scores of 5  [#permalink]

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24 Sep 2018, 02:33
Jeoren wrote:
A student's grade in a college course is determined by the scores of 5 quizzes, a midterm exam and a final exam. The midterm exam and the final exam both count twice as much as a quiz in determining the student's average grade. If the student averages a score of 80 on the quizzes and scored a 90 on the midterm exam, then what would the student have to score on the final exam to have an overall average grade of 85 for the entire course?

A - 85.5
B - 90
C - 92.5
D - 93.5
E - 95

Sorry this concept is not clear to me , can anybody explain. Thanks.
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- Stne
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Joined: 26 Feb 2017
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Re: A student's grade in a college course is determined by the scores of 5  [#permalink]

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24 Sep 2018, 02:59
1
Jeoren wrote:
A student's grade in a college course is determined by the scores of 5 quizzes, a midterm exam and a final exam. The midterm exam and the final exam both count twice as much as a quiz in determining the student's average grade. If the student averages a score of 80 on the quizzes and scored a 90 on the midterm exam, then what would the student have to score on the final exam to have an overall average grade of 85 for the entire course?

A - 85.5
B - 90
C - 92.5
D - 93.5
E - 95

(80*5) + (90*2) + (x*2) = 85*9
580+(x*2) = 765
X=185/2
X=92.5

Is there any other way to solve this question which is faster?

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Joined: 27 May 2012
Posts: 1027
Re: A student's grade in a college course is determined by the scores of 5  [#permalink]

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24 Sep 2018, 03:08
dollytaneja51 wrote:
Jeoren wrote:
A student's grade in a college course is determined by the scores of 5 quizzes, a midterm exam and a final exam. The midterm exam and the final exam both count twice as much as a quiz in determining the student's average grade. If the student averages a score of 80 on the quizzes and scored a 90 on the midterm exam, then what would the student have to score on the final exam to have an overall average grade of 85 for the entire course?

A - 85.5
B - 90
C - 92.5
D - 93.5
E - 95

(80*5) + (90*2) + (x*2) = 85*9
580+(x*2) = 765
X=185/2
X=92.5

Is there any other way to solve this question which is faster?

Sent from my iPhone using GMAT Club Forum mobile app

Thank you, got the concept.
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Re: A student's grade in a college course is determined by the scores of 5  [#permalink]

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17 Jun 2019, 16:39
Jeoren wrote:
A student's grade in a college course is determined by the scores of 5 quizzes, a midterm exam and a final exam. The midterm exam and the final exam both count twice as much as a quiz in determining the student's average grade. If the student averages a score of 80 on the quizzes and scored a 90 on the midterm exam, then what would the student have to score on the final exam to have an overall average grade of 85 for the entire course?

A - 85.5
B - 90
C - 92.5
D - 93.5
E - 95

We can let x = the student’s grade on the final exam. Since the midterm and final grades count twice, we can create the equation:

[5(80) + 2(90) + 2x]/(5 + 2 + 2) = 85

[400 + 180 + 2x]/9 = 85

580 + 2x = 765

2x = 185

x = 92.5

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Manager
Joined: 15 Dec 2016
Posts: 217
A student's grade in a college course is determined by the scores of 5  [#permalink]

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17 Mar 2020, 07:50
Why are you multiplying 85*9

I thought it should be 85*7 (because there are 7 tests at the end of the day)

I understand the midterm and the final count was "Twice as important" but that does mean, there are 9 tests does it ? there are still 7 tests only to my knowledge
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Posts: 217
Re: A student's grade in a college course is determined by the scores of 5  [#permalink]

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21 Mar 2020, 04:26
Bunuel

Why do we multiply 85*9

I thought it should be 85*7 (because there are 7 tests at the end of the day)

I understand the midterm and the final count was "Twice as important" but that does not mean, there are 9 tests does it ? there are still 7 tests only to my knowledge

Posted from my mobile device
Re: A student's grade in a college course is determined by the scores of 5   [#permalink] 21 Mar 2020, 04:26