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GRE Math Challenge #71-number of students in 3 economics
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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?
Re: GRE Math Challenge #71-number of students in 3 economics
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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
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]