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The average (arithmetic mean) number of students in 3 economics classe

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The average (arithmetic mean) number of students in 3 economics classe  [#permalink]

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New post 31 May 2018, 11:06
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Question Stats:

95% (00:56) correct 5% (00:56) wrong based on 26 sessions

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The average (arithmetic mean) number of students in 3 economics classes at a certain college is 24. If the total number of students in 2 of the classes combined is 38, how many students are in the remaining class?

(A) 14
(B) 19
(C) 24
(D) 31
(E) 34

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Re: The average (arithmetic mean) number of students in 3 economics classe  [#permalink]

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New post 31 May 2018, 11:55
Bunuel wrote:
The average (arithmetic mean) number of students in 3 economics classes at a certain college is 24. If the total number of students in 2 of the classes combined is 38, how many students are in the remaining class?

(A) 14
(B) 19
(C) 24
(D) 31
(E) 34



Given Average number of students in three classes are = 24
Therefore total number of the students = 24 * 3 = 72

Given the number of students in two of the classes combined = 38

Hence the number of remaining student in the remaining class = 72 - 38 = 34
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Re: The average (arithmetic mean) number of students in 3 economics classe  [#permalink]

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New post 31 May 2018, 14:56
Bunuel wrote:
The average (arithmetic mean) number of students in 3 economics classes at a certain college is 24. If the total number of students in 2 of the classes combined is 38, how many students are in the remaining class?

(A) 14
(B) 19
(C) 24
(D) 31
(E) 34


ans: E

from Stem: 24 = (A + 38)/3
A=34 ans.
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Re: The average (arithmetic mean) number of students in 3 economics classe &nbs [#permalink] 31 May 2018, 14:56
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