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A cookery course is divided into two groups. In group X, the average s
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20 Oct 2023, 04:02
20 Oct 2023, 04:02
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A cookery course is divided into two groups. In group X, the average score in the test was 76. In group Y, the average score in the test was 70. If the average score of all 30 trainees in the course was 74, how many trainees are in group X?
(A) 10
(B) 17
(C) 20
(D) 25
(E) 28
(A) 10
(B) 17
(C) 20
(D) 25
(E) 28
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Free Materials for the GRE General Exam - Where to get it!!
GRE Geometry Formulas
GRE - Math Book
Re: A cookery course is divided into two groups. In group X, the average s
[#permalink]
20 Oct 2023, 09:31
20 Oct 2023, 09:31
1
Avg of x is 76
Avg of y is 70
Avg of both(x+y=30) =74
76x+70y/(x+y) =74
76x+70y=74*30
76x+70y=2220
x+y=30
y=30-x
76x+70(30-x)=2220
76x+2100-70x=2220
76x-70x=2220-2100
6x=120
x=20
Avg of y is 70
Avg of both(x+y=30) =74
76x+70y/(x+y) =74
76x+70y=74*30
76x+70y=2220
x+y=30
y=30-x
76x+70(30-x)=2220
76x+2100-70x=2220
76x-70x=2220-2100
6x=120
x=20
gmatclubot
Re: A cookery course is divided into two groups. In group X, the average s [#permalink]
20 Oct 2023, 09:31
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