Question

hyy please solve question no. 19

Answer 1

Let the number of boys be "b'' and number of girls be ''g''.
Given avg score of boys = 71
Sum total of boys score = 71*b
Avg score of girls = 73
Sum total= 73*g
The avg score of school = 71.8
Sum total of school score = 71.8*(b+g)
71b + 73g = 71.8*(b+g)
71b + 73g = 71.8b + 71.8g
0.8b = 1.2g
b:g = 1.2:0.8 = 3:2