Question

someone quick urgent give correct answer

Answer 1

Let the number of boys be 'x'

The mean marks of boys are 70,,,
so Mean marks= (Total marks of boys)/No of boys

so the total marks obtained by boys will be 70x.

No. of Girls be 'y'

Total marks obtained by Girls= 73y


Now mean marks of all students(x+y) is 71
i.e
total marks of all the students= 71(x+y)


since total marks will be equal

70x+73y= 71(x+y)
70x+73y= 71x+71y
2y= x
x/y= 2/1
x:y=2:1