Question

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Answer 1

Answer:

I cant see the image

Step-by-step explanation:

Can u repost it

Answer 2

Answer:

Boys: Girls=9:4

Step-by-step explanation:

Let no of boys are x and girls are y

Avg score of boys=71

Thus total marks of x boys=71x

Avg score of girls=73

Thus total marks of y girls=73y

Total marks obtained by boys and girls=71x+73y..........(1)

Now avg of boys and girls=71.8

Total marks obtained by boys and girls=71.8*(x+y)...........(2)

Thus eqn (1) and (2) are equal

71x+73y=71.8(x+y)

71x+73y=71.8 x 71.8y

73y-71.8y=71.8x-71x

1.8y =0.8x

Dividing by xy

1.8/x=0.8/y

Or x/y=1.8/0.8=9/4

Or x:y=9:4

Or Boys: Girls=9:4