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GRE Math Challenge #71-number of students in 3 economics
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03 May 2015, 01:24
03 May 2015, 01:24
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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
(A) 14
(B) 19
(C) 24
(D) 31
(E) 34
Re: GRE Math Challenge #71-number of students in 3 economics
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12 Dec 2017, 12:51
12 Dec 2017, 12:51
1
sandy 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
(A) 14
(B) 19
(C) 24
(D) 31
(E) 34
Here Let x = number of students in the remaining classes
Total no. of students in the two classes = 38
Therefore we can write as = \(\frac{(38 + x)}{3} = 24\)
or 38 + x = 72
or x= 34 students in the remaining classes.
gmatclubot
Re: GRE Math Challenge #71-number of students in 3 economics [#permalink]
12 Dec 2017, 12:51
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