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Carcass
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Joined: 18 Apr 2015
Posts: 15979
GRE 1: Q160 V160
The number of boys [#permalink] New post  15 Jun 2018, 04:40
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#GREpracticequestion The number of boys in the class who took the test.jpg
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Quantity A
Quantity B
The number of boys in the class who took the test
The number of girls in the class who took the test


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
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msk0657
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Joined: 29 May 2018
Posts: 126
Re: The number of boys [#permalink] New post  Updated on: 17 Jun 2018, 04:38
4
Carcass wrote:
Attachment:
test.jpg


Quantity A
Quantity B
The number of boys in the class who took the test
The number of girls in the class who took the test


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.


Let B for Boys and G for Girls.

Now AM = 90B + 81G = 84(B+G)

We finally get 2B = G i.e. G is twice of B.

G is greater.

B.

Originally posted by msk0657 on 15 Jun 2018, 05:43.
Last edited by msk0657 on 17 Jun 2018, 04:38, edited 1 time in total.
avatar
rohithsunny007
Intern
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Joined: 09 Jun 2018
Posts: 1
Re: The number of boys [#permalink] New post  17 Jun 2018, 03:42
msk0657 wrote:
Carcass wrote:
Attachment:
test.jpg


Quantity A
Quantity B
The number of boys in the class who took the test
The number of girls in the class who took the test


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.


Let B for Boys and G for Girls.

Now AM = 90B + 81G = 84(B+G)

We finally get 2B = G i.e. G is twice of B.

G is greater.

B.
User avatar
G
Carcass
Verbal Expert
Joined: 18 Apr 2015
Posts: 15979
GRE 1: Q160 V160
Re: The number of boys [#permalink] New post  13 May 2020, 13:28
3
Expert Reply
There is no need to use algebra here. We just need the weighted average

Girls ----------------------- Average of the class ------------------------ Boys

81 ------------------------------------ 84 ----------------------------------- 90

The distance between 81 and 84 is 3

The distance between 84 and 90 is 6

That means to have the overall average towards (or closer) to the girls they must be more than boys in the classroom. The weight is more.

20-second approach (even less) to solve the question

B is the answer
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GRE: All you do need to know about the GRE Test | GRE Prep Club for the GRE Exam - The Complete FAQ
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ETS: ETS Free PowerPrep 1 & 2 All 320 Questions Explanation. | ETS All Official Guides
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Books: All GRE Best Books
Scores: The GRE average score at Top 25 Business Schools 2020 Ed. | How to study for GRE retake and score HIGHER - (2020)
How is the GRE Score Calculated -The Definitive Guide (2021)
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Krikri9
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Joined: 11 May 2020
Posts: 5
Re: The number of boys [#permalink] New post  13 May 2020, 22:47
The answer is B.
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