The average marks of section A are 65 and that of section B are 70 If the average marks of both the ...........

Quantitative Aptitude (CDS) Average

The average marks of section A are 65 and that of section B are 70. If the average marks of both the sections combined are 67, then the ratio of

number of students of section A to that of section B is

3 : 2

1 : 3

3 : 1

2 : 3

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Explanation:

Let the ratio be x:y
Average marks of section A = 65
Average marks of section A = 65x
Average marks of section B = 70
Average marks of section B = 70y
Total Average = 67
Total marks of both sections = 61(x+y)
According to question,
65x + 70y = 67(x+y)
65x + 70y = 67x + 67y
3y = 2x
3/2 = x/y